ML20004G036
| ML20004G036 | |
| Person / Time | |
|---|---|
| Site: | Peach Bottom  |
| Issue date: | 06/19/1981 |
| From: | Stolz J Office of Nuclear Reactor Regulation |
| To: | Bauer E PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| Shared Package | |
| ML20004A817 | List: |
| References | |
| NUDOCS 8106290006 | |
| Download: ML20004G036 (3) | |
Text
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NUCLEAR REGULATORY COMMISSION o
UNITED STATES E
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WASHINGTOrd, D. C. 20555 I
June 19, 1981 t{'% j f-e....
Dockets flos. 50-277 6
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9-JUN 2 31981
- yT Mr. Edward G. Bauer, Jr.
2 Vice President and General Counsel
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u.a twop* *'"0" I2 Philadelphia Electric Company N""
M. turket Street f
Philadelphia, Pennsylvania 19101 4
Ga to Oear Mr. Bauer:
Our letter of May 15, 1981 transmitted requests for additional infornution needed by us to complete our review of the Peach Bottom Station problems related to degraded grid voltage and station electric distribution voltages.
As a result of telephone calls between our staffs, subsequent to May 15, we require the additional information supplied in the enclosure to this letter.
We request that the additional information be provided within 30 days of your receipt of this letter.
Si'nce rely,
Chief Operating Reactors Branch #4 Division of Licensing
Enclosure:
Requast for Additional Infonnation cc w/o enclosure:
See next page 4
e 006 8106290 Q
Philadelphia Electric Company Eugene J. Bradley U. S. Environmental Protection Agency Philadelphia Electric Company Region III Office Assistant General Counsel ATTN: EIS COORDINATOR 2301 Market Street Curtis Building (Sixth Floor)
Philadelphia, Pennsylvania 19101 6th and Walnut Streets Philadelphia, Pennsylvania 19106 Troy B. Conner, Jr.
1747 Pennsylvania Avenue, N.W.
M. J. Cooney, Superintendent Washington, D. C.
20006 Generation Division - Nuclear Philadelphia Electric Company Raymond L. Hovis, Esq.
2301 Market Street 35 South Duke Street Philadelphia, Pennsylvania 19101 York, Pennsylvania 17401 Government Publications Section Warren K. Rich, Esq.
State Library of Pennsylvania Assistant Attorney General Education Building Depa. bnent of Natural Resources Commonwealth and Walnut Streets Annapolis, Maryland 21401 Harrisburg, Pennsylvania 17126 Philadelphia Electric Company ATTN: Mr. W. T. Ullrich Peach Bottom Atomic Power Station Mr. R. A. Heiss, Cc.rdinato.'
Delta, Pennsylvania 17314 Pennsylvania State Llearin' house Governor's Office of State Planning Albert R. St6el, Chairman and Development Board of Supervisors P. O. Box 1323 Peach Bottom Township Harrisburg, Pennsylvania 17120 R. D. #1 Delta, Pennsylvania 17314 Curt Cowgill U.S. Nuclear Regulatory Commission Office of Inspection and Enforcement Peach Bottom Atomic Power Station P. O. Box 399 Delta, Pennsylvania 17314 l
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REQUEST FOR ADDITIONAL INFORMATION PEACit BOTTOM ATOMIC POWER STATION, UNITS 2 AND 3 DOCKET NOS. 50-277, 50-278
SUBJECT:
GRID VOLTAGE DEGRADATION
REFERENCES:
(1) NRC letter to all power reactor licensees, dated June 2, 1977.
Reference (1), Enclosure 1, page 2, Position 1,c,(1) requests that the...
" time delay, including margin, shall not exceed the maximum time delay that is assumed in the FSAR accident analyses...." The degraded voltage logic scheme for Peach Bottom Units 2 and 3 transfers the Class 1E buses to a second off-site source should the first off-site source be degraded. The licensee should show that for all possible voltage levels and logic schemes, the time delay would not exceed or add to the time assumed in the FSAR accident analyses due to insufficient voltage for Class IE equipment to start or operate.
Since it appears, the proposed 2nd level undervoltage protection logic does not meet this requirement, enclosed is a recently revised Power Systems Branch Technical Position (PSB 1) which outlines an alternate approach accentable to the NRC.
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l April 17,1981 NOTE TO:
PSB Members FROM:
F. Rosa, Acting Chief, PSB
SUBJECT:
BPMCH TECHNICAL POSITION PSB 1 "ADEQl'ACY OF STATION ELECTRIC DISTRIBUTION SYSTEM VOLTAGES"
REFERENCE:
Memorandum to PSB Members from R. Fitzpatrick, dated March 11, 1981
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Enclosed is the finalized branch technical position (BTP) on the above subject.
Thank you for your input in response to the above reference in enabling us to finalize the position in a timely fashion.
This BTP is effective immediately.
It is a preferred method over the old PSB Review Reminder #3 but it in no way detracts from the acceptability of designs in accordance with Review Reminder #3.
The guidance of part 4 concerning an acceptable verification testing program should be applied across-the-board to all plants [0Rs, OLs & cps] that have not alreaty either provided or proposed an accepted verification testing program.
You should bring the revised criteria of part 1 to the attention of those licensees / applicants that have designs now under review simply for their information and inform them that they may opt for the revised design criteria if they so choose. However, this should not become a mechanism to substantially delay implementation of a final design.
This BTP will be part of our Chapter 8 submittal of revised SRPs scheduled for completion by May 1,1981.
wt Faust Rosa, Acting Chief Power Systems Branch, DSI
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cc:
R. Mattson P. Check L. Riani DUPLICATE DOCUMENT i
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Contact:
Entire document previously R. Fitzpatrick entered into system under:
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