ML20024A817
| ML20024A817 | |
| Person / Time | |
|---|---|
| Site: | Maine Yankee |
| Issue date: | 05/27/1983 |
| From: | Garrity J Maine Yankee |
| To: | Allan J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| JHG-83-125, MN-83-113, NUDOCS 8307010006 | |
| Download: ML20024A817 (2) | |
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e; MAIRE &n@HARHEE ATOMIC Pol'IER ComPARU *,ugugr,j,?n"gyl N-Y (207) 623-3521
-Q May 27, 1983 W4-83-113 JHG-83-125 Region I United States Nuclear Regulatory Commission Office of Inspection and Enforcement 631 Park Avenue King of Prussia, Pennsylvania 19406 Attention: Mr. James M. Allan, Deputy Administrator
Reference:
(a) License No. OPR-36 (Docket No. 50-309)
(b) MYAPCo Letter to USNRC dated May 3, 1983 (MN-83-78)
Subject:
Containment Weight of Air Monitoring System
Dear Sir:
Maine Yankee Atomic Power Company hereby submits the following report in accordance with Technical Specification 3.11.D.l.
The information in this report supplements Reference (b).
Maine Yankee reported, in Reference (b), fluctuations observed in the real time computer-calculated " containment weight of air" parameter used to monitor and trend containment leak tightness. A failure in the recirculation fan in the Exactel Servo-Manometer was determined to be the cause of the fluctuations. The fan was replaced, the system was calibrated, and following a two-day observation period, the system was returned to service on May 2, 1983.
On May 5, 1983, a constant increase was observed in the real time computer-calculated " containment weight of air" parameter. Manometer readings did not confirm the increase, therefore, the computer calculated parameter was removed from service and hand-calculations commenced. The NRC resident inspector was notified that the containment weight of air monitoring system was out of service.
An investigation showed that the Exacte1, a mechanical monitoring device which provides containment pressure input to the computer calculations, was stuck and its output was no longer representative of containment pressure.
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MAINE YANKEE ATOMIC POWER COMPANY 6
United States Nuclear Regulatory Commission May 27, 1983 Attention: Mr. James M. Allan Page Two M-83-113 On May 12, 1983, the Exactel was replaced with an electronic pressure monitoring device (Mensor). The Mensor provides the same pressure input as the Exactel, however, it (being electronic) is not susceptible to the same failures as the mechanical Exactel.
The Mensor was calibrated and activated on May 17, 1983. Comparisons between the Mensor output and hand-calculations continued for 44 hours5.092593e-4 days <br />0.0122 hours <br />7.275132e-5 weeks <br />1.6742e-5 months <br /> and upon satisfactory results, the containment weight of air monitoring system was declared operable at 0900 on May 19, 1983.
We trust that this information is satisfactory; however, if you have any questions, please feel free to contact us.
Very truly yours, MAINE YANKEE ATOMIC POWER COWANY 0
1 An John H. Garrity, Senior Dire ctor Nuclear Engineering and Lice sing JHG:pjp cc: Mr. Robert A. Clark Mr. Paul D. Swetland
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