ML20213E309
| ML20213E309 | |
| Person / Time | |
|---|---|
| Site: | Columbia  |
| Issue date: | 12/21/1982 |
| From: | Speis T Office of Nuclear Reactor Regulation |
| To: | Novak T Office of Nuclear Reactor Regulation |
| References | |
| CON-WNP-0558, CON-WNP-558 NUDOCS 8212300097 | |
| Download: ML20213E309 (3) | |
Text
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1 DEC MEMORANDUM FOR:
Thomas M. Novak, Assistant Director for Licensing Division of Licensing FROM:
Themis P. Speis, Assistant Director for Reactor Safety Division of Systems Integration
SUBJECT:
WNP-2 STANDBY SERVICE WATER MULTIPLEXER Plant Name: WNP-2 Docket No.:
50-397 Licensing Stage: OL Responsible Branch:
LB #2 Project Manager:
R. Auluck ICSB Reviewer:
J. Rosenthal Review Status:
OL The purpose of this memorandum is to describe required modifications and testing of the WNP-2 Standby Service Water Multiplexer. These requirements should be forwarded to the applicant.
Control of the WNP-2 standby service water system is provided using a multiplexer system. Staff concerns related to the multiplexer are enumerated in the WMP-2 SER, where it is identified as an open item.
A meeting was held on May 19, 1982, to discuss these concerns. The meeting followed the agenda provided by R. Auluck in the meeting notice of May 6, 1982. WPPSS supplied a sumary of the meeting and response to additional questions by letter from G.D. Bouchey, WPPSS, to A. Schwencer, NRC, G0 2-82-634, August 2,1982.
The purpose of the meeting, and response to additional questions, was to provide the staff with sufficient infomation concerning the operation and potential failure modes of the multiplexer system to enable the staff to judge confomance to the applicable General Design Criteria and Reg-ulatory Guides.
Based on the infomation provided to the staff, two substantive concerns remain: (1) qualification of the multiplexers for electromagnetic inter-ference, and (2) the fault tolerance of the plant design should the multiplexers exhibit non-mechanistic common mode failure.
Contact:
J. Rosenthal, ICSB t?ono a A.
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T. flovak WPPSS has addressed these issues in their August 2, 1932 letter.
ResponseQO31.139(7) clearly states "no specific EMI tests have been perforned on the multiplexing system." The response includes technical arguments that the multiplexer equipment is not susceptible to EMI.
however, similar equipment, i.e., equipment employing like components, has been routinely tested for DiI susceptibility.
The susceptibility of the equipment to EMI is a function of the specific component physical and electrical configuration and of the card / module packaging. The susceptibility to EMI is not readily ascertained, short of testing. Hence specific EMI testing should be performed. The testing may be perfomed in a laboratory or in the field. The Supply System should demonstrate that the multiplexer equipment is not susceptible to the EMI environment of the plant. Radiative and conductive coupling should be considered. Electrical noise sources to be considered should include:
radiation from portable comunication equipment, large electric motors and breakers, arc welders, and lightning.
A test plan should be prepared and submitted to the staff prior to testing. Test results should be submitted subsequent to testing.
The test results should qualitatively and quantitatively demonstrate that the goals of the test plan have been met, show deficiencies, and remedial action.
ResponseQO31.139(2) discusses manual initiation of the standby service water system independent of the remote multiplexer operation.
The standby service water pump could be operated at the switchgear and valves may be hand operated from the service water' pumphouse. The applicant has estimated that upon reaching a service water pumphouse it would require about 20 minutes each to open 3 valves and an additional 2 minutes each to open 2 additional valves, in order to place one division of standby service water in operation. Clearly these times are too long to protect the plant by manual operation should the multiplexers fail.
For example, a diesel, upon starting in response to a loss of offsite power, will fail if cooling water from the standby service water system is not provided to the diesel within about a minute if diesel protection is bypassed or fails. The staff will require that the applicant modify the plant design such that the standby serv. ice water system may be r.anually initiated and/or aligned independent of the multiplexers in a timely manner.
The applicant should detemine the time duration following plant trip that decay heat may be transferred from the core to contain-ment (suppression pool) prior to exceeding containment design limits without operation of the standby service water system.
The applicant should modify the plant such that the standby service water system may be placed into service within the time duration detemined above assuming comon mode failure of the standby service water multiplexers. Equipment which is required for long tem heat removal should be suitably protected following plant trip and subsequent equipment demand and prior to postulated delayed operation of the standby service water system.
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OFFICIAL RECORD COPY
T. Novak..
The ACRS letter to Chaiman Palladino, "ACRS Report on Washington Public Power Supply System liuclear Project No.
2", October 13, 1932 discusses this matter and states: "Because of the importance of this system to safety, we recomend that the IIRC Staff confim that service water needed for shutdown decay heat removal can be made available' oven. if-the rulti-plexing system malfunctions. The Committee wishes.to be' kept infomed regarding this matter."
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.:. Mn Themis P. Speis, Assistant Director for Reactor Safety Division of Systems Integration cc:
R. ifattson DISTRIBUTION:
E. Rossi Docket File J. Rosenthal ICSB Reading File R. Kendall J. Rosenthal ( PF )
R. Auluck T. Speis A. Schwencer WNP-2 Subject File F. Rosa O
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!!EMORAtlDUt1 FOR:
A. Schwencer, Chief Licensing Branch No. 2, DL FROM:
R. Auluck, Project Manager Licensing Branch No. 2 DL
SUBJECT:
FORTHCOMING MEETIllG WITH WASHIf(GTON PUBLIC POWER SUPPLY SYSTEM (WPPSS)
DATE & TIliE:
January 5,1983 9:00 Att LOCATI0t!:
R00m 319 EW - Operations Center Dethesda, !!D PURPOSE:
Discussion with WPPSS Management on request for limited exemption regarding Prompt Notification System PARTICIPANTS:
l'RC WPPSS R. C. DeYoung G. D. Bouchey J. H. Sniezek V. Everett B. K. Grimes R. Haight F. G. Paganoa D. B. !!atthews R. Auluck D(
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J R. Aulbck, Project !!anager Licensing Branch No. 2 Division of Licensing cc: See next page 1
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0FC 2 3 1982 Date:
MEETING NOTICE DISTRIBUTION:
Document Control (50-373}
-NRC PDR L PDR NSIC PRC NRC PARTICIPANTS:
LB#2' Reading E. Hyl ton R. C. DeYoung Project Manager RAuluck J. H. Sniezek B. K. Grime:
H. Denton/E. Case D. Eisenhut/R. Purple F. G. Pagano T. M. Novak*
D. B. Matthews B. Youngblood R. Auluck A. Schwencer G. Knighton E. Adensam G. Lainas F. Miraglia J. P. Knight W. Johnston D. Mull er T. Speis R. Houston L. Rubenstein
. 1---
F. Schroeder M. Ernst J. Kramer NRR Division Directors
- Paton OELD Attorney E. L. Jordan, DEQA:IE J. M. Taylor, DRP:IE
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Phillips Building Receptionist **
ACRS (.16)
Region V
cc:
Service List Resident Inspector
- 0nly if participant in meeting
- 0nly if meeting held in Bethesda hw e
WNP-2 Mr. R. L. Ferguson Managing Director
_ ashington Pub-lic Power Supply System W
P. O. Box 968 3000 George Washington Way Richland, Washington 99352 cc:
Nicholas Reynolds, Esquire Debevoise & Libernen 1200 Seventeenth Street, N. W.
Washington, D. C.
20036 Mr. G.E. Doupe, Esquire Washington Public Power Supply System P.O. Box 968 3000 George Washington Way Richland, Washington 99352 Nicholas Lewis, Chairman Energy Facility Site Evaluation Council Mail Stop PY-11 Olympia, Washington 98504 Roger Nelson, Licensing Manager Washington Public Powe,r Supply System P.O. Box 968 Richland, Washington 99352 Mr. W.G. Conn, Sr. N/M Group Supervisor Burns and Roe, Incorporated 601 Williams Boulevard Richland, Washington 99352 Mr. Richard Feil U.S. NRC Resident Inspector WPPSS-2 NPS P.O. Box 69 Richland, Washington 99352 Dr. G.D. Bouchey Deputy Director, Safety & Security Washington Public Power Supply System P.O. Box 968, MD 650 Richland, Washington 99352 6
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