ML20132D816
| ML20132D816 | |
| Person / Time | |
|---|---|
| Site: | Calvert Cliffs  |
| Issue date: | 09/26/1985 |
| From: | Lundvall A BALTIMORE GAS & ELECTRIC CO. |
| To: | Martin T NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| RTR-NUREG-0737, RTR-NUREG-737, TASK-2.F.1, TASK-TM NUDOCS 8509300298 | |
| Download: ML20132D816 (3) | |
Text
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BALTI MORE GAS AND ELECTRIC CHARLES CENTER.P.O. BOX 1475 BALTIMORE, MARYLAND 21203 ARTHun E. LUNDVALL Jn.
vice PatsaDENT SUPPLY September 26,1985 Mr. T. T. Martin, Deputy Regional Administrator Region I U. S. Nuclear Regulatory Commission 631 Park Avenue King of Prussia, PA 19406 Dear Mr. Martim This letter is submitted as a followup concerning an item discussed at the enforcement conference held on August 14, 1985, between members of your staff and BG&E plant management on the status of Post Accident Sampling at Calvert Cliffs. The outstanding item was the status of environmental qualification of the Containment High Range Radiation Monitors, specifically the installation of heat shrink tubing over the cable connectors inside containment.
These radiation monitors were installed in the Calvert Cllifs Unit Nos. I and 2 Containment Structures to meet the requirements of NUREG-0737, item II.F.1,.
The complexity of evolution of environmental qualification requirements over the past six years necessitates a brief summary of the history as it relates to environmental qualification of these cable connectors.
This chronology is included as the enclosure to this letter.
In summary, it is our position that the history of the environmental qualification of these instruments is consistent with the NRC requirements in effect at the time each maintenance or modification action was completed.
The present installation also complies with the current requirements of 10 CFR 50.49(k).
liad any of these instruments been replaced, they would have been upgraded consistent with the requirement of 10 CFR 50.49(1).
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Mr. T. T. Martin September 26,1985 Page 2 Nevertheless, on September 6,1985, the connectors for both Unit I and 2 Containment High Range Radiation Monitors inside containment were fitted with Raychem heat shrink tubing.
Our subsequent investigation of this issue has demonstrated that this conservative action was not necessary, as shown above.
Should you have any questions regarding this matter, please contact us.
Very truly yours,
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l AEL/LES/sjb Enclosure cc:
D. A. Brune, Esquire G. F. Trowbridge, Esquire D. H. Jaffe, NRC T. Foley, NRC l
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I ENCLOSURE (1)
History of Maintenance Actions of Containment High Range Radiation Monitor Connectors NRC EQ BG&E Design Time Frame Action Criteria EQ Criteria Comments Unit 1 Unit 2 Dec:mber June A commercial grade, NUREG-0588 Raychem heat shrink The originally specified 1980 1981 custom-modified (on-(CategoryI) tubing was specified.
connector (Amphenol) was not site) connector was available due to long lead installed with heat time (> 9 months).
shrink tubing June July Cabling to the monitor NUREG-0588 No heat shrink was The new connector was a rela-1982 1982 was replaced as recom-(Category I) specified in the tively high cost, high quality mended by the manu-engineering instruc-connector. The heat shrink was facturer. The new tions or Technical deemed to be unnecessary. This connector was avail-Manual. The material better connector was being used able, so it was specification under in several applications at installed.
which the material was Calvert Cliffs.
purchased included environmental qualif-ication requirements.
This documentation was considered acceptable.
July NRC Inspection Team 10CFR50.49 The earlier equip-Complete documentation is 1985 discovered that no heat Para.(k) and ment qualification required for all Environmentally shrink was installed on (1) would be acceptable Qualified equipment. The files Unit 1, and that the EQ as specified in now specify that heat shrink file specified heat shrink 10 CFR 50.49(k).
tubing will be required for future was required for the installations. The sleeving is original connector, now installed.
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