ML16342C765
| ML16342C765 | |
| Person / Time | |
|---|---|
| Site: | Diablo Canyon  |
| Issue date: | 12/09/1994 |
| From: | Peterson S Office of Nuclear Reactor Regulation |
| To: | Rueger G PACIFIC GAS & ELECTRIC CO. |
| References | |
| GL-93-04, GL-93-4, TAC-M86844, TAC-M86845, NUDOCS 9412160183 | |
| Download: ML16342C765 (8) | |
Text
December 9,
1994 Mr.-Gregory H. Rueger Nuclear Power Generation, B14A Pacific Gas and Electric Company 77 Beale Street, Room 1451 P. 0.
Box 770000 San Francisco, California 94106
SUBJECT:
RESPONSES TO GENERIC LETTER 93-04, "ROD CONTROL SYSTEM FAILURE AND WITHDRAWAL OF ROD CLUSTER CONTROL ASSEMBLIES, 10 CFR 50.54(f)"
FOR DIABLO CANYON NUCLEAR POWER PLANT, UNIT NO.
1 (TAC NO. H86844)
AND UNIT NO.
2 (TAC NO. M86845)
Dear Hr. Rueger:
By letters dated August 5, and September 17, 1993, you responded to Generic Letter (GL) 93-04.
In your response, you committed to perform the current order surveillance test following each refueling outage and to implement a
current order timing modification during the fall 1995 refueling outage for Unit 1
and spring 1996 refueling outage for Unit 2.
The staff, by letter dated November 10, 1994, to the Westinghouse Owners Group (WOG), approved the following documents:
(1) WCAP-13864, Rev.
1, "Rod Control System Evaluation Program,"
(2) Westinghouse Technical Bulletin NSD-TB-94 RO, "Rod Control CROM Timing Change,"
and (3)
"WOG Recommended Rod Control System Surveillance Test."
The current order timing modification does not affect normal rod motion, but prevents asymmetric rod withdrawal should a
Salem-type failure occur.
This modification was successfully tested at the Ginna Station on April 15, 1994.
The new current order surveillance test (to be done each refueling outage) verifies that no failures exist in the Rod Control System current order circuits.
The staff finds that the WOG's
- response, as discussed in the above Westinghouse documents, is an acceptable long-term resolution to GL 93-04.
The staff requests that after you have fully implemented the current order timing modification and the new current order surveillance test, you inform the staff in writting.
The staff also encourages you to consider implementation at your first opportunity.
Please inform us in 30 days if our understanding of your commitment is incorrect.
9Ol2i60i43 9OSZOe PDR ADOCK 05000275 PDR Docket Nos.
50-275 and 50-323 cc:
See next page Sincerely, OliIGINAL SIGNED BY:
Sheri R. Peterson, Project Manager Project Directorate IV-2 Division of Reactor Projects III/IV Office of Nuclear Reactor Regulation DOCUMENT NAME:
DCGL934.LTR OFC DRPW/LA NAME DFoster-Curseen DATE 12/
/94 PDIV-2 P
SPeterson:ye 12 4/94 NRR:SRXB RJones 12/
94 OFFICIAL RECORD COPY f QUOc.O
,t k
Mr. Gregory M. Rueger Pacific Gas and Electric Company Diablo Canyon CC:
NRC Resident Inspector Diablo Canyon Nuclear Power Plant c/o U.S. Nuclear Regulatory Commission P. 0.
Box 369 Avila Beach, California 93424 Dr. Richard Ferguson, Energy Chair Sierra Club California 6715 Rocky Canyon
- Creston, California 93432 Hs.
Nancy Culver San Luis Obispo Mothers for Peace P. 0.
Box 164 Pismo Beach, California 93448 Ms. Jacquelyn C. Wheeler P. 0.
Box 164 Pismo Beach, California 93448 Managing Editor The Count Tele ram Tribune 1321 Johnson Avenue P. 0.
Box 112 San Luis Obispo, California 93406 Chairman San Luis Obispo County Board of Supervisors Room 370 County Government Center San Luis Obispo, California 93408 Mr. Truman Burns Mr. Robert Kinosi an California Public Utilities Commission 505 Van Ness, Room 4102 San Francisco, California 94102 Hr. Steve Hsu Radiologic Mealth Branch State Department of Health Services Post Office Box 942732 Sacramento, California 94234 Regional Administrator, Region IV U.S. Nuclear Regulatory Commission Harris Tower & Pavillion 611 Ryan Plaza Drive, Suite 400 Arlington, Texas 76011-8064 Hr. Peter H. Kaufman Deputy Attorney General State of California 110 West A Street, Suite 700 San Diego, California 92101 Christopher J. Warner, Esq.
Pacific Gas
& Electric Company Post Office Box 7442 San Francisco, California 94120 Hr. John Townsend Vice President and Plant Manager Diablo Canyon Power Plant P. 0.
Box 56 Avila Beach, California 93424 Diablo Canyon Independent Safety Committee ATTN:
Robert R. Wellington, Esq.
Legal Counsel 857 Cass Street, Suite D
Monterey, California 93940
1<<'r r
December 9,
1994 Hr. Gregory H.'ueger Nuclear Power Generation, B14A Pacific Gas and Electric Company 77 Beale Street, Room 1451 P. 0.
Box 770000 San Francisco, California 94106
SUBJECT:
RESPONSES TO GENERIC LETTER 93-04, "ROD CONTROL SYSTEM FAILURE AND WITHDRAWAL OF
~ ROD CLUSTER CONTROL ASSEMBLIES, 10 CFR 50.54(f)"
FOR DIABLO CANYON NUCLEAR POWER PLANT, UNIT NO.
1 (TAC NO. H86844)
AND UNIT NO ~
2 (TAC NO. M86845)
Dear Mr. Rueger:
By letters dated August 5; and September 17,
- 1993, you responded to Generic Letter (GL) 93-04.
In your response, you committed to perform the current order surveillance test following each refueling outage and to implement a
current order timing modification during the fall 1995 refueling outage for Unit 1 and spring 1996 refueling outage for Unit 2.
The staff, by letter dated November 10, 1994, to the Westinghouse Owners Group (WOG), approved the following documents:
(1) WCAP-13864, Rev.
1, "Rod Control System Evaluation Program,"
(2) Westinghouse Technical Bulletin NSD-TB-94 RO, "Rod Control CROM Timing Change,"
and (3)
"WOG Recommended Rod Control System Surveillance Test."
The current order timing modification does not affect normal rod motion, but prevents asymmetric rod withdrawal should a
Salem-type failure occur.
This modification was successfully tested at the Ginna Station on April 15, 1994.
The new current order surveillance test (to be done each refueling outage) verifies that no failures exist in the Rod Control System current order circuits.
The staff finds that the WOG's
- response, as discussed in the above Westinghouse documents, is an acceptable long-term resolution to GL 93-04.
The staff requests that after you have fully implemented the current order timing modification and the new current order surveillance test, you inform the staff in writting.
The staff also encourages you to consider implementation at your first opportunity.
Please inform us in 30 days if our understanding of your commitment is incorrect.
Sincerely, ORIGINAL SIGNED BY:
Sheri R. Peterson, Project Manager Project Directorate IV-2 Division of Reactor Projects III/IV Office of Nuclear Reactor Regulation Docket Nos.
50-275 and 50-323 cc:
See next page DOCUMENT NAME:
DCGL934.LTR OFC DRPW/LA ~
PDIV-2/P NRR:SRXB NAME DATE DFoster-Curseen 12
/94 SPeterson:ye 12 %/94 OFFICIAL RECORD COPY RJones 12 94
r'"y
D SIRIBU ION:
Letter to Hr. Gregory H. Rueger dated December 9,
1994 Docket File PU PDIV-2 R/F JRoe TQuay DFoster-Curseen SPeterson OGC ACRS (4)
TAlexion HChatterton
- KPerkins, RIV/MCFO
t i~