Part 21 Report - 1996-751
ACCESSION #: 9610310065
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AV AUTOMATIC VALVE
41144 Vincent Court Novi MI USA 48375-1924
Telephone 810-474-6700 Facsimile 810-474-6732
World Class Air Valves and Controls
OCTOBER 28, 1996
SUBJECT: 10CFR21 NOTIFICATION OF POTENTIAL DEFECT
On 09-02-96 Jim Wethington, of Commonwealth Edison-Quad Cities NPS,
notified Automatic Valve that a Main Steam Isolation Valve (MSIV) EPN
1-0203-1D had failed to close in the 3-5 seconds required by their
technical specifications. The solenoid valves associated with the MSIV
had recently been replaced by Quad Cities personnel. Following
replacement, the MSIV stroked property under cold conditions (reactor
shutdown and solenoid valves de-energized prior to testing). The concern
was identified while re-timing the MSIV during plant start-up. After the
solenoids had remained energized for several hours the MSIV would not
close within the required 3-5 seconds.
On 09-03-96 Todd Hutchins of Automatic Valve inspected the solenoid at
the Quad Cities facility and determined that the 6910-0x0 solenoid
plunger was 1.322-1.327" in length. The correct specified length is
1.287-1.295". The probable cause of the incorrect length appeared to be
a missed machining operation at time of manufacture.
A solenoid plunger of this length restricts the exhaust port in the
plunger stem. This potentially can prevent any equipment operated by the
solenoid from operating within its intended time requirement.
On 09-04-96 Todd Hutchins and Jim Wethington discussed the non-
conformance and initial corrective action with Keith Walton and Laura
Collins of the Nuclear Regulatory Commission located at the Quad Cities
Automatic Valve verified that all of the 6910-0x0 solenoid plungers
currently in their stock were the correct length and added a specific
inspection requirement for all future plungers.
To prevent any additional valves from being rebuilt with potentially long
plungers Automatic Valve requested all customers who had received kits
containing the 6910-0x0 solenoid plunger in the last two years to verify
the plunger length. It had been Automatic Valve's experience that kits
supplied previous to the two year cutoff were already installed in
operating valves and could not immediately be measured.
The defective solenoid from Quad Cities was returned on 09-27-96 to
Automatic Valve for additional testing and root cause determination.
Frank Lentin of Commonwealth
October 28, 1996
Subject: 10CFR21 Notification of Potential Defect
Edison notified Automatic Valve that a 10CFR21 review had been initiated
and that a decision on potential reportability was required by 11-04-96.
On 10-17-96 preliminary test data indicated that field detection of the
non-conforming plunger was possible with a dimensional inspection
(requiring the solenoid to be disassembled) or time testing the product
after the solenoid had reached it's stabilized temperature (but not
during its initial cold state).
Since the missed machining operation on the plunger was an omission in
the machining process, the problem is not lot specific. Potentially all
solenoid valves manufactured since 02-03-70 (utilizing the 10 watt #6910-
0x0 solenoid) with the model numbers prefixed A, B, C, K, or U are
affected. If you are unsure as to whether this affects you, please
submit questionable part numbers to Automatic Valve for verification.
There have been no reported non-conforming plungers shipped in the
previous 26 years.
All known customers (list attached) were verbally notified of the
potential problem, verbally notified of the recommended corrective
action, given an assurance that a formal 10CFR21 decision would-be made
by 11-04-96 and that they would receive a copy.
The formal corrective action report (attached) was completed on 10-28-96
and outlines the problem, root cause, corrective action, implementation,
and preventative action.
This letter intends to fulfill Automatic Valve's obligation under
10CFR21 and is being sent with all attachments to all known customers who
have purchased products containing the potentially long plunger and who
have imposed 10CFR21 in their purchase order.
Should you have any additional questions, please feel free to contact me.
Very truly yours,
AUTOMATIC VALVE CORPORATION
AUTOMATIC VALVE CORRECTIVE ACTION 10/28/96
1. Team: Jim Wethington, Quad Cities NPS, tel:309.654.2241x2190
Todd Hutchins, Automatic Valve, tel:810.474.6700
2. Problem: On 09-02-96 MSIV #1-0203-1D would not fast close within the
3-5 second technical specification when the solenoids had been
energized for a minimum of two hours at a minimum of 90'F ambient.
3. Containment: Air pack ser# D53325 was removed from MSIV #1-0203-1D
for inspection by Automatic Valve personnel at Quad Cities. Air
pack ser# D53332 was rebuilt for installation on MSIV #1-0203-1D on
4. Cause: One plunger from solenoid 6910-0x0 missed the machining
operation after the viton insert was pressed in.
5. Corrective action:
5.1 For products in the field:
Verify the plunger length to be 1.287-1.295" or
verify when de-energized that the application speed meets
technical specifications after the solenoid has been
energized for a minimum of two hours at a minimum of 90'F
5.2 For products at Automatic Valve:
Verify flow/response time and/or verify plunger
6.1 Verified that the non-conforming plunger was fully
assembled but had missed the machining operation (based on
x-rays and photos).
6.2 Verified that the non-conforming plunger when energized
for minimum of two hours at a minimum of 90'F ambient
would cause significant delay in de-energize flow time
(test report PV-UTL-46 attached).
6.3 Verified that the non-conforming plunger could be
identified by a flow/response time test.
7.1 Plants should verify that the plunger length is 1.287-
1.295" or verify when de-energized that the application
speed meets technical specifications after the solenoid
has been energized for a minimum of two hours at a minimum
of 90'F ambient.
7.2 Automatic Valve added plunger length as a critical 'to be
inspected' dimension on the inspection print (print #6910-
0X0 attached). Current stock at Automatic Valve was re-
inspected and found all to be within tolerance. Service
kits sold to customers in 1995 and 1996 still in stock
were re-inspected and found all to be within tolerance
AUTOMATIC VALVE CORRECTIVE ACTION 10/28/96
7.3 Automatic Valve verified flow/response time and/or plunger
length on all shipments since 09-04-96.
7.4 On 10-28-96 Automatic Valve notified in writing all known
customers who had purchased products containing the
potentially long plunger and who had imposed 10CFR21 in
their purchase order.
8.1 Plants should add plunger dimensions to field rebuild
instructions (example attached).
8.2 Automatic Valve added critical solenoid dimensions to
engineering 'critical characteristics' procedure.
8.3 Automatic Valve added flow/response time requirements to
final test procedure.
9. Verification: Monitor testing and field feedback data.
AUTOMATIC VALVE LOCN: I:\DSS\DOCUMENT\PVUTL46 DATE: 10-26-1996
TEST NUMBER: PV-UTL-46
To determine the effects of ambient temperatures on the energize and de-
energize times of solenoid 6910-0X0, with:
o Non-conforming 6910-001 solenoid plunger - length of 1.322 -
1.327 - as returned from Commonwealth Edison.
o Conforming 6910-001 solenoid plunger - length of 1.287 - 1.295
1. Run all tests at 80 psig using filtered non-lubricated air.
2. Attach solenoid manifold with non-conforming plunger to test plate
3. With the manifold at ambient temperature, record the following
temperatures - also refer to figure 1.
3.1. Ta-Ambient temperature
3.2. T1 - Temperature of solenoid adapter nut.
3.3. T2- Temperature of solenoid coil housing.
3.4. T3 - Temperature of solenoid manifold block.
(Note: Physically mark the locations where temperature readings are
taken and take all subsequent temperature readings at the same
4. Determine flow and exhaust response times taking 3 to 5 readings
waiting a minimum of 10 minutes between readings to allow system to
4.1 During each reading record temperatures at locations designated
in paragraph 3.
5. With the manifold at ambient temperature, energize the solenoid for
a minimum of 2 hours.
5.1. Record temperatures T1 through T3 per paragraph 3.
5.2 Determine flow and exhaust response times and record
temperatures per paragraphs 4 through 4.1.
6. Disconnect air inlet line, remove the pressure transducer and place
the manifold, test plate, and load chamber in an oven and heat to 90
degrees F for a minimum of 1/2 hour with the solenoid energized.
6.1. Measures temperatures T1 through T3 per paragraph 3 prior to
running response tests.
6.2 Determine flow and exhaust times and record temperatures per
paragraphs 4 through 4.1.
6.2.1 During the wait between readings, reinsert the
manifold in the oven to re-establish temperatures.
7. Repeat paragraph 6 through 6.2 at oven temperatures of 90 degrees F,
100 degrees F, 125 degrees F, and 150 degrees F.
8. Repeat paragraphs 2 through 7 with conforming solenoid plunger.
Number Description Calibration Date
APG-2 0 to 60 160 PSIG pressure gage 10-02-1996
NIC-3091 Osciloscope 06-10-1996
7199 Thermocouple thermometer 10-04-1996
TTT-1100-550 Thermometer 11-07-1995
SPT-667388 Pressure transducer 06-24-1996
AUTOMATIC VALVE LOCN: I:\DSS\DOCUMENT\PVUTL46 DATE: 10-26-1996
Table "TEST RESULTS (AVERAGES" omitted.
1. Ambient temperature fluctuations have little effect on either the
energized or de-energized times with the conforming plunger
2. Ambient temperature fluctuations have only a slight effect on the
energized times with the non-conforming plunger installed.
3. Ambient temperature fluctuations have a significant effect on de-
energized times with the non-conforming plunger As the data shows,
at an ambient temperature of 90 degrees F the unit became, for
practical purposes, non functional. The 'quickest' exhaust time
with the surface of the body at 93.4 degrees F was 54 seconds
compared to 0.145 for the manifold with the conforming plunger.
4. At a minimum ambient temperature of 90 degrees F and with the
solenoid coil energized for a minimum of 2 hours, the delay in the
de-energized time would be easily detectable. As the ambient
temperature increases, the delay becomes more and more noticable.
Conducted by : Brian Bielat Title: Engineer Date: 10-25-1996
Analized by: Title: VP Eng/Mfg Date: 10-26-1996
Approved by: Title: VP Eng/Mfg Date:
Figure "AUTOMATIC VALVE SOLENOID #6910-0X0 10/28/96" omitted.
AUTOMATIC VALVE SHIPPEDKITSWITH6910-0X0 10/25/96
UNIT 1 (2)
Figure 4 "Ref: GE SIL 505, MSIV SOLENOID MANIFOLD" omitted.
GENERAL INFORMATION or OTHER EVENT NUMBER: 31229
LICENSEE : AUTOMATIC VALVE NOTIFICATION DATE: 10/28/96
CITY: NOVI REGION: 3 NOTIFICATION TIME: 12:13 [ET]
COUNTY: STATE: MI EVENT DATE: 10/28/96
LICENSE #: AGREEMENT: N EVENT TIME: 00:00[EST]
DOCKET: LAST UPDATE DATE: 10/28/96
NRC NOTIFIED BY: HUTCHINS
HQ OPS OFFICER: CHAUNCEY GOULD VERN HODGE
EMERGENCY CLASS: NOT APPLICABLE
10 CFR SECTION:
WINF INFORMATION ONLY
CCCC 21.21 UNSPECIFIED PARAGRAPH
AUTOMATIC VALVE WAS NOTIFIED BY COMMONWEALTH EDISON-QUAD CITIES
MAIN STEAM ISOLATION VALVED FAILED TO CLOSE WITHIN THE 3-5 SECONDS
REQUIRED BY THEIR TS. FURTHER INSPECTION BY AUTOMATIC VALVE
DETERMINED THAT THE "6910-0X0" SOLENOID PLUNGER WAS TOO LONG. THE
PROBABLE CAUSE FOR THE INCORRECT LENGTH APPEARED TO BE A MISSED
OPERATION AT TIME OF MANUFACTURE.
AUTOMATIC VALVE VERIFIED THAT ALL SOLENOID PLUNGERS OF THIS TYPE IN
STOCK WERE THE CORRECT LENGTH AND ADDED A SPECIFIC INSPECTION
FOR ALL FUTURE PLUNGERS. AUTOMATIC VALVE REQUESTED THAT ALL
WHO RECEIVED KITS WITHIN THE LAST 2 YEARS CONTAINING THIS TYPE
VERIFY THE PLUNGER LENGTH.
AUTOMATIC VALVE 10CFR21NOTIFICATION 10/25/96
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