ML13330A273
| ML13330A273 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 03/24/1981 |
| From: | Crutchfield D Office of Nuclear Reactor Regulation |
| To: | Dietch R Southern California Edison Co |
| References | |
| REF-GTECI-B-23, REF-GTECI-B-48, REF-GTECI-CR, REF-GTECI-FU, TASK-B-23, TASK-B-48, TASK-OR LSO5-81-03-054, LSO5-81-3-54, NUDOCS 8104020168 | |
| Download: ML13330A273 (6) | |
Text
DISTRIBUTION:
March 24, 1981 LPDR Docket No. 50-206 TERA LSO5-81-03-054 NSIC JOlshinski DEisenhut DCrutchfield
/pA Mr. R. Dietch, Vice President HSmith APR Nuclear Engineering and Operations SNowicki Southern California.Edison Company OELD 2244 Walnut Grove.Avenue OI&E (3)
Post Office.Box 800.
ACRS (10)
Rosemead, California 91770 Gray File Xtra Cy (6)
Dear Mr. Dietch:
SUBJECT:
DEGRADED GRID VOLTAGE/ADEQUACY OF STATION ELECTRIC DISTRIBUTION SYSTEM VOLTAGES - GENERIC ISSUES 8-23 AND 8-48 We have reviewed your letter dated November 4, 1977, concerning the Degraded Grid Voltage generic issue as it applies to San Onofre Unit 1.
Enclosure l.presents the staff position and requetts for additional information.. The requested information has been discussed with your staff in previous telephone conversations.
We have also reviewed your letter dated May 1, 1980, concerning the
,adequacy of Station Electric Distribution System Voltages generic issue as it applies to San Onofre Unit 1. Enclosure 2 requests additional information as a result of our review.
Please provide written.responses to both enclosures within 45 days of receipt of this letter. If you have any.qidstions concerning this request, please contact your project manager Stanley J. Nowicki.
orgnio Czut,cfield Dennis Mo.ruent Dennis M. Crutchfield, Chief Operating Reactors Branch #5 Division of Licensing
Enclosures:
As stated above cc w/enclosures:
See next page I
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P. D 5/c SURNAME)
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- ,R REG(,,
oP UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D. C. 20555 March 24, 1981 Docket No. 50-206 LS05-81-03-054 Mr. R. Dietch, Vice President Nuclear Engineering and Operations Southern California.Edison Company 2244 Walnut Grove Avenub Post Office Box 800 Rosemead, California 91770
Dear Mr. Dietch:
SUBJECT:
DEGRADED GRID VOLTAGE/ADEQUACY OF STATION ELECTRIC DISTRIBUTION SYSTEM VOLTAGES.- GENERIC ISSUES B-23 AND B-48 We have reviewed your letter dated November 4, 1977, concerning the Degraded Grid Voltage generic issue as it applies to San Onofre Unit 1. presents the staff position and requests for additional information. The requested information has been discussed with your staff in previous telephone conversations.
We have also reviewed your letter dated May 1, 1980, concerning the adequacy of Station Electric Distribution System Voltages generic issue as it applies to San Onofre Unit 1. Enclosure 2 requests additional information as a result of our review.
Please provide written responses to both enclosures within 45 days of receipt of this letter. If you have any questions concerning this request, please contact your project manager Stanley J. Nowicki.
- Siyerely, n 1 M.
ci Operating Reactors Bra h 5 Division of Licensing
Enclosures:
As stated above cc w/enclosures:
See next page
Mr. R. Dietch 2 -
March 24, 1981 cc w/enclosures:
Charles R. Kocher, Assistant.
Director, Criteria and Standards General Counsel Division Southern California Edison Company Office of Radiation Programs Post Office Box 800 (ANR-460)
Rosemead, California 91770 U. S. Environmental Protection Agency David R. Pigott Washington, D. C. 20460 Samuel B. Casey Chickering & Gregory U. S. Environmental Protection Three Embarcadero Center Agency Twenty-Third Floor Region IX Office San Francisco, California 94111 ATTN:
EIS COORDINATOR 215 Freemont Street Jack E. Thomas San Francisco, California 94111 Harry B. Stoehr San Diego Gas & Electric Company P. 0. Box 1831 San Diego, California 92112 Resident Inspector/San Onofre NPS c/o U. S. NRC P. 0. Box 4329 San Clemente, California 92672 Mission Viejo Branch Library 24851 Chrisanta Drive Mission Viejo, California 92676 Mayor City of San Clemente San Clemente, California 92672 Chairman Board of Supervisors County of San Diego San Diego, California 92101 California Department of Health ATTN:
Chief, Environmental Radiation Control Unit Radiological Health Section 714 P Street, Room 498 Sacramento, California 95814
ENCLOSURE 1 Request for Additional Information San Onofre #1 Degraded Grid Voltage Ref. 1:
NRC letter>(A. Schwencer) to SCE (J. B. Moore),
dated June 3, 1977 Ref. 2:
SCE letter (K., P. Baskin) to NRC (A. Schwencer) dated November 4, 1977 Ref. 3:
IEEE Std-279-1971, "Criteria for Protection
(
Systems for Nuclear Power Generating Stations."
- 1. Ref. 1, Staff Position 2, states that in the event the load shedding feature is retained, the setpoint values of voltage and time in the Technical Specifications must be specified having maximum and minimum limits (+).
Ref. 2, page 7, defines the setpoints for the CV-7 relay (4160 volt bus) at 82 volts with a time dial setting of 1.2.
Submit the maximum and minimum (+) voltages and time setpoints.
(Refer to Model Technical Specifications Table 3.3-4 of Ref. 1.)
- 2. Ref. 2, page 7, defines the setpoints for the CV-6 relay (4160-volt bus) at 105. volts with a time dial setting of 2.3.
Submit the maxi am and minimum (+) voltages and time setpoints for the CV-6 relay.
(Refer to Model Technical Specifications Table 3.3-4 of Ref. 1.)
- 3. Ref. 2, page 10, item e, refers to the existing undervoltage protection not satisfying requirements of IEEE 279-1971, in regard to single failure criteria and testing provisions.
By letter dated December 21, 1976 to the NRC, additional relays were proposed to meet these requirements.
Submit voltage and time setpoints with tolerances (+) of these addi onal relays. Also, Ref. 1, Staff Position 1, requires a monthly test
of the undervoltage protection system. Submit proposed Technical Specification changes of surveillance requirements to comply with Staff Position 1. (Refer to Model Technical Specification Table 4.3-2 of Ref. 1.)
4.. What are the voltage nameplate 'ratings of all Class 1E motors?
- 5. Ref. 1, Enclosure 1, page 6, paragraph 1. The intent of the NRC staff positions on Degraded Voltage Protection of the Emergency Power Systems is that under.a degraded voltage condition on the Class 1E buses,-the buses be disconnected from the preferred source, the loads be shed, the diesel generators started, and the Class 1E. buses energized automatically w-ith or without a safety injection signal.
This is in line with Ref.
3, Section 4.1 and 4.6, which states that the protection system shall "auto matically initiate" protection action and "shall go to completion."
Describe your compliance.
ENCLOSURE 2 REQUEST FOR ADDITIONAL INFORMATION SAN ONOFRE #1 ADEQUACY OF STATION ELECTRIC DISTRIBUTION SYSTEM VOLTAGES Ref. 1:
NRC letter (W.
Gammill) to all power licensees; dated August 8, 1979.
Ref. 2:
SCE letter (K. P. Baskin) to NRC (D. L. Ziemann),
dated May 1, 1980.
- 1. Ref. 1, page 2, paragraph 3, requests that a description of the test method used to verify the voltage analyses be submitted. Ref. 2 did not provide this test description. Submit a detailed description of the test method used to verify the voltage analyses. The test results can be subiitted at a later date. The test should be conducted when the Class IE buses are at least 40% loaded.
- 2. Do the low voltage.AC. (less than 480 volts) Class IE buses supply any instruments or control circuits required by GDC-13? If so, provide terminal voltages to demonstrate that all low-voltage AC Class.IE equip ment will be operating within their required voltage ratings for each case analyzed.
- 3. Per Guidelines 3 and 9 (Ref. 1), confirm that the undervoltage protection relays (first and second levels) and the Class IE motor starter contactors will not drop out when the largest non-Class IE load starts and reaches steady state while the Class IE buses are fully loaded for the worst case conditions analyzed.
- 4. Ref. 2, enclosure 1, page 7, states that when the grid is at the maximum expected value of 234.5KV, system voltage is 102% of the transformer rating of 230KV at San Onofre #1. Submit the calculated terminal voltages on all Class IE equipment when the grid is at 234.5KV (maximum expected) and minimum plant loading.