ML20126K060
| ML20126K060 | |
| Person / Time | |
|---|---|
| Site: | Calvert Cliffs  |
| Issue date: | 05/07/1981 |
| From: | Lundvall A BALTIMORE GAS & ELECTRIC CO. |
| To: | Eisenhut D Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8105110199 | |
| Download: ML20126K060 (2) | |
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BALTIM O RE GAS AND
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CHARLES CENTER P. O. BOX 1475. BALTIMORE, MARYLAND 21203 ARTHUR E. LUNDVALL, JR.
vice Pats.orst suasw
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Mr. D. G. Eisenhut, Director Division of Licensing
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Office of Nuclear Peactor Pegulation
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U. S. Nuclear Regulatory Commission Washington, D. C.
20555
Subject:
Calvert Cliffs Nuclear Power Plant Units Nos.1 & 2, Dockets Not. 50-317 6 50-318 Overational "estinc of the Automatic Halon 1301 Fire Suppression Systems FCR Mos. 70-102h & B0-1027
Dear "r. Fisenhut:
Please refer to our Mr. A. E. Lundvall's letters dated March 26, 1081 and Acril 6, 1981. In the letter of March 26, 1981, we retorted on the ocerational test of the Halon 1301 system protecting Cable Spreading Room No. 1, during which difficulty was experienced with interlocking control viring to ventilation dampers. We corrected this problem and verified the gas tightness of the rooms to ensure that there was no other significant leakage. Durine a second operational test on April 29, 1o81, the mechanical and electrical functions of the system tested satisfactorily.
However, our exacting performance specifications were not met in that the design concentrations at selected test locations were not attained over the entire " soak" period. We have not accepted the system from the vendor or manufacturer because of failing to attain uniform distribution of acent within the room and its associated cable chase. We are meeting with 1
apuroeriate vendors during the first week of May and, barring a major redesign of the system, we anticipate performing an enerational retest within thirty days.
In the interin, the Halon 1301 avstems are fully functional and have been placed in service for the Cable Spreading Rooms. However, since design concentrations were exceeded durine the latest cerformance test in some areas, ve have found it prudent to issue special instructions to disarm the system during maintenance / modification vork when workers are required to work within the cable chases or from ladders or scaffolds within the room.
"hese temporary instructions and controls vill be administered by the Control Poem Oeerator.
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. May 7, 1981 4 4 i
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1 With respect to the Halen 1301 Superession Systems for the. four Svitchgear Rooms, ve completed installation erior to April 20, in accordance with our Aeril 6, 1081 commitment.
'a'e are now performing ereocerational l
tests to verify system electrical and mechanical functions, including inter-locks to shut down ventilation.
In view of the difficulty attaining uniform l
agent distribution within design concentration limits for the specified time l
vithin the Cable Screading Poems, we are not confident that we vill meet our t
commitment to put in service the Halen 1301 systems for the Switchgear Rooms i
by May 18 and June 1 for Units 1 and 2 respectively.
In-the interest of.
j employee and operational safety, we must. further verify design and test these systems.
Based on the above, ve request an extensio of the commitment dates as-follows:
1.i l 1.
TCP No. To-102h - Halon Surpression Syster.s in the Cable i
Spreading Rooms, Units 1 and 2, until June 8, 1081.
2.
FCR No. 80-1027 - Halon Suepression Systems in the Svitchgear Rooms Units 1 and 2, until June 22, 1081.
Very truly yours, /'
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J. A. Biddison, Esquire j
G. F. "'rowbridge, Esquire Mr. E. L. Conner, Jr. - NFC
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Mr. R. E. Architzel, Fesident Inspector, CCNPP l
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