ML20040G118
| ML20040G118 | |
| Person / Time | |
|---|---|
| Site: | Grand Gulf  |
| Issue date: | 02/08/1982 |
| From: | Dale L MISSISSIPPI POWER & LIGHT CO. |
| To: | Eisenhut D Office of Nuclear Reactor Regulation |
| References | |
| RTR-NUREG-0803, RTR-NUREG-803 AECM-82-46, GL-81-34, NUDOCS 8202110284 | |
| Download: ML20040G118 (2) | |
Text
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MISSISSIPPI POWER & LIGHT COMPANY Helping Build Mississippi EnMIMiddB P. O. B O X 16 4 0, J A C K S O N, MISSISSIPPI 39205 j
NUCLEAR PRODUCTION DEPARTMENT y
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U. S. Nuclear Regulatory Commission
, f Office of Nuclear Reactor Regulation a
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Washington D.C.
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Attention:
Mr. D. G. Eisenhut, Director b
Dear Mr. Eisenhut:
SUBJECT:
Grand Gulf Nuclear Station Units 1 and 2 Docket Nos. 50-416 and 50-417 File 0272/L-814.0/6140 l
Response to Generic Letter 81-34 l
on NUREG-0803 AECM-82/46 On August 31, 1981, the NRR issued Generic Letter 81-34 for response by all BWR Licensees. Generic Letter 81-34 directly addresses the implementation of the conclusions of NUREG-0803 " Generic Safety Evaluation Report Regarding Integrity of BWR Scram System Piping." This letter transmits Mississippi Power & Light Company's (MP&L) response on this concern.
The Grand Gulf Nuclear Station is a BWR 6 with a Mark III containment design. The hydraulic control units (HCU) which contain the scram system piping and valves is located immediately above the suppression pool. Any water released from a failure of the scram system piping would be dumped to the pool.
Since the suppression pool in a Mark III containment is a source of makeup water back to the reactor vessel no loss of long term water eupply would be experienced. The Mark III design also precludes the need for operator entry into the containment to isolate a scram system failure before radiation levels are within safe limits.
In response to the earlier NUREG-0785 on the same subject GE submitted NED0-24342, "CE Evaluation in Response to URC Request Regarding BWR Scram System Pipe Breaks" to the NRC.
The NRC's review of NEDO-24342 in light of NUREG-0/85 provided the basis for formulation of NUREG-0803. The position taken by GE as indicated in the cover letter of April 30, 1981 transmitting NED0-24342 to the NRC, states:
"Notwithstanding the remote probability of this scenario taking place, it would not apply to the BWR 6 Mark III.
The reason is the location of the scram system piping and headers; water would flow to the wetwell and return to the vessel."
The NRC also confirns this position as discusqed in section 2.2.1 of NUREG-0803.
0 8202110284 820200 PDR ADOCK 05000416 lember Middle South Utilities System M
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e AECM-82/46 Page 2 MISTITTIPPI POWER O LIGHT COMPANY Irrespective of the overall position taken by General Electric in NEDO-24342 on the integrity of the scram system against pipe breaks for all BWR's, it is MP&L's position that the design of the Grand Gulf Nuc3:aar Station as a BWR 6/ Mark III precludes the application of NUREG-0803 for our plant.
Yours truly, L. F. Dale Manager of Nuclear Services SAB/S!!H/JDR:ph cc:
Mr. N. L. Stampley Mr. R. B. McGehee Mr. T. B. Conner Mr. G. B. Taylor Mr. Richard C. PeYoung, Director Office of Inspection & Enforcement U. S. Nuclear Regulatory Conmission Washington, D. C.
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