ML19276G613
| ML19276G613 | |
| Person / Time | |
|---|---|
| Site: | Pilgrim |
| Issue date: | 07/17/1979 |
| From: | Andognini G BOSTON EDISON CO. |
| To: | Ippolito T Office of Nuclear Reactor Regulation |
| References | |
| 79-145, NUDOCS 7907240253 | |
| Download: ML19276G613 (1) | |
Text
BOSTON EDISDN COMPANY DENERAL OFFICES 800 BOYLETON STREET easTON, M ASSACNUSETTs 02199 i
D. CamL ANDDGNINt E U PE RINT ENDENT NUCLE AR OPERATIONE DEPARTMENT July 17, 1979 BECo. Ltr. #79-145 Mr. Thomas A. Ippolito, Chief Operating Reactors Branch #3 l
Division of Operating Reactors Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Washington, D. C.
20555 License No. DPR-35 Docket No. 50-293 Fire' Protection SER Item 3.1.2 Design Change
Dear Sir:
The Pilgrim Nuclear Power Station Unit #1 Safety Evaluation Report Item #3.1.2 required that a guard pipe be provided to protect motor control center B-18 (23-foot level of the reactor building) from a fire water pipe failure. We feel that an alternate method can be used to assure that motor control center B-18 is adequately protected.
We propose to qualify the existing fire protection pipeline within a suitable distance from MCC B-18 (ten feet from each end of the MCC minimum) to with-stand worst case earthquake loadings. The qualification process will consist of Class 2 stress analysis using the CDC PIPESD program with earthquake, dead-load, thermal, and pressure load combination analysis meeting tiie requirements of USNRC Regulatory Guide 1.92, Revision 1, 1976.
equate supports / restraints will be provided to sustain the pertinent load ci-fcombinations.
We trust this method is satisfactory; however, if any questions arise do not hesitate to contact us.
e Very truly yours, l/
W'"
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7 90724 0 J58 1