Implementation of TMI Action ITEM II.K.3.5, "Automatic Trip of Reactor Coolant Pumps" (Generic letter No. 86-06)
UNITED STATES
NUCLEAR REGULATORY COMMISSION
WASHINGTON, D. C. 20555
May 29, 1986
TO ALL APPLICANTS AND LICENSEES WITH COMBUSTION ENGINEERING (CE) DESIGNED
NUCLEAR STEAM SUPPLY SYSTEMS (NSSSs) (EXCEPT MAINE YANKEE)
SUBJECT: IMPLEMENTATION OF TMI ACTION ITEM II.K.3.5, "AUTOMATIC TRIP OF
REACTOR COOLANT PUMPS" (GENERIC LETTER NO. 86-06)
Gentlemen:
The purpose of this letter is to inform you of (1) the staff's conclusions
regarding the CE Owners Group (CEOG) submittals on reactor coolant pump trip
in response to Generic Letters 83-10a and b, and (2) provide guidance
concerning implementation of the reactor coolant pump trip criterion. Our
Safety Evaluation (SE) on this subject is enclosed for your use.
With regard to the CEOG submittals referenced in Section V of the enclosed
SE, we conclude that the methods employed by the CEOG to justify manual
reactor coolant pump (RCP) trip are consistent with the guidelines and
criteria provided in Generic Letters 83-10a and b. The approved CE Small
Break LOCA Evaluation Model was used to demonstrate compliance with 10 CFR
50.46 and Appendix K to 10 CFR Part 50.
We have determined that the information provided by the CEOG in support of
the trip-two/leave-two staggered reactor coolant pump trip criterion is
acceptable. The generic information presented by the CEOG, however, does not
address plant specific concerns about instrumentation uncertainties,
potential reactor coolant pump problems and operator training and procedures
as requested in Generic Letter 83-10. This information, contained in Section
IV of the SE, is now being requested to assess implementation of the RCP
trip criterion.
Accordingly, for those applicants and licensees who choose to endorse the
CEOG methodology, we request that operating reactor licensees implement the
RCP trip criterion based upon the CEOG methodology. Schedules for submittal
of information requested in Section IV of the SE (refer to Appendix A for
considerations associated with Generic Letters 83-10a and b) should be
developed with your individual project managers within 45 days from receipt
of this letter. The requested information does not constitute a new
requirement but only identifies information specified in Generic Letters
83-10a and b which has not been provided under the CEOG generic program. In
the event that licensees decide not to trip the RCP (an option provided for
in Generic Letters 83-10a and b), they should respond to the questions in
Section IV of the SE and refer to Appendix B of the SE. Applicants should
provide the appropriate response to the extent that this information is
known at this time.
Those applicants and licensees who choose not to endorse the CEOG
methodology should submit a schedule for submittal of plant specific RCP
trip Criteria or justification for non-trip of RCPs within 45 days of
receipt of this letter.
- 2 -
This request for information was approved by the Office of Management and
Budget under clearance number 3150-0011 which expires September 30, 1986.
Comments on burden and duplication may be directed to the Office of
Management and Budget, Reports Management, Room 3208, New Executive Office
Building, Washington, D.C. 20503.
Our review of your submittal of information in response to this letter is
not subject to fees under the provisions of 10 CFR 170. However, should you,
as part of your response or in a subsequent submittal, include an
application for license amendment or other action requiring NRC approval, it
is subject to the fee requirements of 10 CFR 170 with remittal of an
application fee of $150 per application (Sections 170.12(c) and 170.21) and
subsequent semiannual payments until the review is completed or the ceiling
in Section 170.21 is reached.
If you believe further clarification regarding this issue is necessary or
desirable, please contact Mr. R. Lobel (301 492-9475.)
Sincerely,
Frank J. Miraglia, Director
Division of PWR Licensing-B
Enclosure:
Safety Evaluation
cc w/enclosure:
Service Lists
Page Last Reviewed/Updated Tuesday, March 09, 2021