United States Nuclear Regulatory Commission - Protecting People and the Environment

ACCESSION #: 9610080102

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GENERAL INFORMATION or OTHER                 EVENT NUMBER: 31093

LICENSEE: LASALLE COUNTY STATION        NOTIFICATION DATE: 10/04/96
   CITY:                 REGION: 3      NOTIFICATION TIME: 15:35 [ET]
  COUNTY:                 STATE: IL     EVENT DATE:         09/28/96
LICENSE#:             AGREEMENT: Y      EVENT TIME:         12:00[CDT]
  DOCKET:                               LAST UPDATE DATE:   10/04/96

                                             NOTIFICATIONS

NRC NOTIFIED BY: MR. SUBALUSKY
HQ OPS OFFICER: DOUG WEAVER             VERN HODGE          NRR

EMERGENCY CLASS: NOT APPLICABLE
10 CFR SECTION:
[Illegible] CCC 21.21    UNSPECIFIED PARAGRAPH

                               EVENT TEXT

PART 21 NOTIFICATION ON WKM MODEL 70-13 PNEUMATIC ACTUATORS

ANCHOR DARLING VALVE COMPANY PERFORMED EFFECTIVE DIAPHRAGM AREA
(EDA)
TESTING ON THE VARIOUS WKM MODEL 70-13 PNEUMATIC ACTUATORS (SIZES 35,
70,
140, 280).  THE PRELIMINARY TEST RESULTS INDICATED THAT THE ORIGINAL
EFFECTIVE DIAPHRAGM AREA VALUES USED TO CALCULATE THE BENCH SET
AND
SUPPLY AIR SET POINTS WERE INCORRECT.  THESE ACTUATORS ARE USED ON
VARIOUS PRIMARY CONTAINMENT ISOLATION VALVES AND THESE VALVES
MAY NOT
PROVIDE ADEQUATE SYSTEM ISOLATION UNDER DESIGN ACCIDENT
CONDITIONS.

LASALLE UNIT ONE IS IN COLD SHUTDOWN AND UNIT TWO IS IN THE REFUEL
MODE.

FAX                           Date 10/04/96

                              Number of pages including cover sheet  7

TO:  Nuclear Regulatory       FROM:     W.  T.  Subalusky
     Commission                         Site Vice-President
     OPS Center                         LaSalle County Station

                              Phone     815-357-6761
                              Fax Phone 815-357-6761, ext.  2502

Fax  Phone 301-816-5151
Verification 301-816-5100

RE:  LaSalle County Station
     Units 1 and 2
     10CFR Part 21
     Notification 9605

REMARKS: [x] Urgent [] For your review [] Reply ASAP [] Please Comment

Attached are the above-entitled documents including one (1) cover
letter;
one (1) Memorandum, and Notification.

LaSalle Generating Station
2601 North 21st Road
Marseilles, Illinois 61341-9757
Tel 815 357-6761

ComEd

October 4, 1996

United States Nuclear Regulatory Commission
Attention: Document Control Desk
Washington, D.C.  20555

Subject:  LaSalle County Station Units 1 and 2
          10CFR Part 21 Notification 9605
          NRC Docket Numbers 50-373 and 50-374

Enclosed is ComEd's 10CFR Part 21 Notification of the deficiency of WKM
model 70-13 Pneumatic Actuators manufactured by the Anchor Darling Valve
Company and in use at LaSalle County Station.  This notification is
submitted in accordance with the requirements of 10CFR 21, Section
21.1(b), 21.3a(3), and 21.3d(4).

It there are any questions or comments concerning this letter, please
refer them to me at (815) 357-6761, extension 3600.

Respectfully,

W.  T.  Subalusky
Site Vice President,
LaSalle County Station

Enclosure

cc:  A.  B.  Beach, NRC Region III Administrator
     M.  P.  Huber, NRC Senior Resident Inspector - LaSalle
     D.  M.  Skay, Project Manager - NRR - LaSalle
     F.  Niziolek, Office of Nuclear Facility Safety - IDNS
     DCD - Licensing (Hardcopy: Electronic: )
     Central File

A Unicom Company

Memorandum

ComEd

Date:     October 3, 1996

To:       Nuclear Licensing

From:
          Charles J. Bohan                   Date
          SEC Engineer

          Baron S.  Westphal                 Date
          SEC Pump & Valve Supervisor

          Petros Antonopoulos                Date
          SEC Manager

Subject:  Part 21 Notification 96-05 WKM, model 70-13 Pneumatic
          Actuators-Incorrect Effective Diaphragm Area

LaSalle Site Support Engineering has evaluated the subject document and
determined that the defect/noncompliance is reportable under the
requirements of 10CFR Part 21.  The attached report has been prepared
for
submittal to the NRC, and should be submitted by October 4, 1996, to the
NRC Operations Center.

Questions regarding this report should be directed to Mark Smith, ext.
2323.

Enclosure

cc:  President and Chief Operating Officer
     Senior Vice President, Nuclear Operations
     Chief Nuclear Operating Officer
     Vice President Nuclear Engineering
     Nuclear Station Managers
     Site Engineering Manager
     Part 21 Committee
     Licensing Operations Director

A Unicom Company

                       10CFR Part 21 Notification

               10 CFR Part 21 Interim Report (File 96-05)
                 WKM, MODEL 70-13 PNEUMATIC ACTUATORS -
                   INCORRECT EFFECTIVE DIAPHRAGM AREA

Applicability   This notification is submitted in accordance with the
requirements of 10CFR Part 21, Section 21.1 (b), 21.3a(3), and 21.3d(4).

This is an interim report, a final report or update will be provided
within sixty days.

Identification      LaSalle County Station, Units One and Two
of Facility and     Commonwealth Edison
Component           Chicago, Illinois

                    WKM, Model 70-13 pneumatic actuators (sizes 35, 70,
                    140, 280)

Identification      Anchor Darling Valve Company
of Component
Manufacturer

Nature of Defect

Anchor Darling Valve Company performed effective diaphragm area (EDA)
testing on the various WKM.  Model 70-13 pneumatic actuators (sizes 35,
70, 140, 280).  The preliminary test results indicated that the original
effective diaphragm area values used to calculate the bench set and
supply air set points were incorrect.

Safety Significance

Potentially, the listed Primary Containment Isolation System (PCIS)
valve
assemblies would not provide adequate system isolation under designed
accident conditions.  The PCIS function may not have operated if
required.

LaSalle Unit One is in Cold Shutdown mode and Unit Two is in Refuel
mode.
The PCIS function for the listed valves is not required for these modes.

Time of Discovery

September 28, 1996

Corrective Actions

1) All affected valves are being reviewed/evaluated, design changes are
being initiated as required.

It should be noted that the WKM Series 70-13 actuator is currently
manufactured by the Anchor Darling Valve Company and similar valves may
have been previously manufactured under the "Muesco" or "B, S & B"
designations.

2) LaSalle is awaiting the publication of Anchor Darling's final testing
reports.  A final notification will be made at that time.

Table "10 CFR Part 21 Interim Report (File 96-05) Number and Location of
All Defective Components", 3 pages, omitted.

*** END OF DOCUMENT ***

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