ML20049J411

Requests Electrical Schematic,Elementary Diagrams & Other Drawings That Show Proposed Atmospheric Dump Valve (Adv) Sys,Within 15 Days.Previous Commitments Re Corrective Actions Not Met

ML20049J411
Person / Time
Site:	Rancho Seco
Issue date:	03/04/1982
From:	Stolz J Office of Nuclear Reactor Regulation
To:	Mattimoe J SACRAMENTO MUNICIPAL UTILITY DISTRICT
References
TAC-42933, NUDOCS 8203180140
Download: ML20049J411 (4)

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DEisenhut RECEIVED OELD I

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fir J. J. flattimoe Assistant General llanagcr and fCRS-10 Chief Engineer ra 3

Sacramento Municipal Utility RIngram

,1Padovan District EB1ackwood N

6201 S Street H0riutein P. O. Box 15330 Sacramento, California 95813 Gray File

SUBJECT:

ATl10 SPHERIC DUMP VALVE C0ffTROL AflD OVERRIDE CIRCUITRY Our August 15, 1980 letter identified a situation;at Rancho Seco where failure of the power supply to the non-nuclear instrumentation (titlI) or the integrated control system (ICS) can result in automatic opening of the atmospheric dump valves (ADVs). The ADVs would open to the 50% open position without valve position indicating available in the control room. This anomaly could significantly aggravate an overcooling transient.

In your October 6,1980 letter you proposed corrective actions which l

would be part of your auxiliary feedwater syston (AFWS) upgrade. You also committed to submit the dump valve control and overrido re-design to us by October 15, 1980 He received your flovember 17,1980 AFils design submittal but we were not able to find the ADV information.

After numerous discussions with your staff to obtain the requested information, we expected the ADV information to be included in your September 8,1981 revised ARIS sulxnittal. We are still unable to locate this information.

Accordingly, please give us the following information within 15 days of receipt of this letter.

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1) Electrical schematic, elementary diagrams and any other drawings that show the proposed ADV system.

In particular we need drawings that show the control of valve position, all power sources to the controlling mechanisms, and drawings of any other electrical systems that could cause failure of the ADVs.

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. 2) A description of the proposed ADV control circuits.

4 Thd reporting requirenents contained in this letter affect fewer than ten respondents; therefore, Of1B clearance is not required under P.L. 9G-511.

Sincerely, John F. Stolz, Chief Operating Reactors Branch #4 Division of Licensing cc: See next page f

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OFFICIAL RECORD COPY usam mi--ssm Nac,onu ais cio-eoj uncu o24o

Sacramento Municipal Utility Rancho Seco Docket No. 50-312 District ccw/ enclosure (s):

' David S. Kaplan, Secretary and Christopher Ellison, Esq.

General Counsel Dian Grueuich, Esq.

Sacramento Itunicipal Utility California Energy Commission District 1111 Howe Avenue 6201 S Street Sacramento, California 95825 P. O. Box 15830 Sacramento, California 95813 Ms. Eleanor Schwartz California State Office 600 Pennsylvania Avenue, S.E., Rm. 201 Sacramento County Board of Supervisors Washington, D. C.

20003 827 7th Street, Room 424 Sacramento, California 95814 Docketing and Service Section Office of the Secretary Business and Municipal Department U.S. Nuclear Regulatory Comission Sacramento City-County Library Washington, D. C.

20555 828 I Street Resident Inspector / Rancho Seco Sacramento, California 95814 c/o U. S. Ni R. C.

.1410 Twin Cities R. d Herald, CA 95638 Dr. Rir.hard F. Cole Atomic Saft.tv & Licensing Board Panel U.S. Nuclear Regulatory Commission Washington, D. C.

20555

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Regional Radiation F.epresentative EPA Reaion IX Mr. Frederick J. Shon 215 Fremont Street Atomic Safety and Licensing Board San Francisco, California 94111 Panel U.S. Nuclear Regulatory Comission Mr. Robert B. Borsum Washington, D. C.

20555 Babcock & Wilcox Nuclear Power Generation Division Elizabeth S. Bowers Esq.

Suite 220, 7910 Woodmont Avenue Chairman, Atomic Safety and Bethesda, Maryland 20814 Licensing Board Panel U.S. Nuclear Regulatory Comission Thomas Baxter, Esq.

Washington, D. C.

20555 Shaw, Pittman, Potts & Trowbridge 1800 M Street, N.W.

Washington, D. C.

20036 Herbert H. Brown, Esq.

Lawrence Coe Lanpher, Esq.

Hill, Christopher and Phillips, P.C.

1900 M Street, N.W.

Atomic Safety and Licensing Board Washington, D. C.

20036 Panel U.S. Nuclear Regulatory Comission Helen Hubbard Washington, D. C.

20555 P. O. Box 63 Sunol, California 94586

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4 Sacramento Municipal Utility.

District Atomic Safety and Licensing Appeal Mr. Robert H. Engelken, Regional Administrator U. S. Nuclear Regulatory Comission, Region V Board Panel 1990 N. California Boulevard, Suite 202 U.S. Nuclear Regulatory Commission Walnut Creek, California 94596 Washington, D. C.

20555 Alan S. Rosenthal, Chairman Atomic Safety and Licensing Appeal Board U. S. !!uclear Regulatory Connission Washington, D. C.

20555 Dr. John H. Buck Atonic Safety and Licensing Appeal Board U. S. Nuclear Regulatory Commission Washington, D. C.

20555 Christine li. Kohl Atomic Safety and Licensing Appeal Board U. S. Nuclear Regulatory Comission Washington, D. C.

20555 California Department of Health ATTN: Chief Environmental Radiation Control Unit Radiological Health Section 714 P Street, Room 498 Sacramento, California 95814 l

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