ML20004B599
| ML20004B599 | |
| Person / Time | |
|---|---|
| Site: | Pilgrim |
| Issue date: | 04/21/1981 |
| From: | Morisi A BOSTON EDISON CO. |
| To: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| 81-82, IEB-79-26, NUDOCS 8105290142 | |
| Download: ML20004B599 (2) | |
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BCGTON EDISON C O M PANY DENEm AL OrrscEs 800 BOvLaTON STmEET G O STO N. M AS EACHUS ETTe 0219 9 A. V. M O RISI HUCLEAR OPERATI SUPPORT DEPARTMENT April 21,1981 BECo. L e
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fir. Boyce H. Grier, Director UQ ' 7 7pg 2,-
2 Office of Inspection and Enforcement
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U.S. Nuclear Regulatory Commission 631 Park Avenue J
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License No. DPR-35 Docket No. 50-293 I_n_ formation for Item 4 IE Bulletin 79-26, Revision 1 References : 1.
" Control Dlade Examination Results and Response to Item 4 of IE Bulletin 79-26,"
NEDE-24325-P, (General Electric Proprietary) and NED0-24325, March 1981.
2.
" Evaluation of Control Blade Lifetime With Potential Loss of 84C, "NEDE-24226-P (General Electric Proprietary) and NED0-24226, December 1979; NEDE-24226-P (General Electric Proprietary) Supplement 1, March 1981.
Dear Sir:
This letter transmits one (1) copy each of the Reference 1 Reports which satisfy the requirements of Item 4 in IE Bulletin 79-26, Revision 1.
Reference 1 provides the results of additional post-irradiation examina-tions, and comparisons of the post-irradiation examination results to a new boron depletion analytical model developed by General Electric. The boron depletion model described in Reference 1 is shown to be in good agreement with the post-irradiation examination data.
General Electric demonstrates in Reference 1 that the control blade destructive examination data presented in References 1 and 2 are applicable to and representative of, the control blades in Pilgrim Nuclear Power Station.
The reports confinn that the loss of boron based on 50% local boron de-pletion is predictable, and is not affected by the plant (s) operating para-meters.
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'.dbSTON Eo: SON COMPANY lir. Boyce H. Grier, Director April 21,.1981 Page 2 Reference 1 contains information which General Electric Company customarily maintains in confidence and withholds from oublic disclosure. The informa-
-tion has been handled and classified as pro' rietary to General Electric, and -
p we hereby request that NEDE-24325-P be withheld from public disclosure in accordance with provisions of 10CFR2.790.
Very truly yours, i
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cc: Director United States Nuclear Regulatory Commission Office of Inspection and Enforcement i
Division of Reactor Operations Inspection Washington, D. C.
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