ML20196H011

Special Rept 97-001:on 970620,removed High Range Radioactive Noble Gas Effluent Monitor (Stack Ragems) from Service to Allow Secondary Calibr IAW Master Surveillance Schedule. Completed Calibr on 970628 & Returned Stack Ragems to Svc

ML20196H011
Person / Time
Site:	Oyster Creek
Issue date:	07/11/1997
From:	Roche M GENERAL PUBLIC UTILITIES CORP.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
6730-97-2193, 97-001, 97-1, NUDOCS 9707230277
Download: ML20196H011 (2)

Text

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{ GPU Nuclear,Inc.

( U.S. Route #9 South orked ve NJ 087310388 Tel 609 9714000 July 11,1997 6730-97-2193 U. S. Nuclear Regulatory Commission Attn.: Document Control Desk Washington, DC 20555

Subject:

Oyster Creek Nuclear Generating Station Docket No. 50-219 Special Report 97-001 Enclosed is Special Report 97-001. This occurrence did not impact the health and safety of the public.

If any additional information or assistance is required, please contact Mr. John Rogers of my staff at 609.971.4893.

Very truly yours, 9

kk of Michael B. Roche Vice President and Director Oyster Creek a

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MBR/JJR 9 cc: Oyster Creek NRC Project Manager Administrator, Region I Senior Resident Inspector j 9707230277 970711 l PDR ADOCK 05000219

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Oyster Creek Nuclear Generating Station l

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. Special Report: SR 97-001

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Report Date:

Date of Occurrence

June 20,1997 Identi0 cation of Occurrence: l The High Range Radioactive Noble Gas Effluent Monitor (Stack RAGEMS) was inoperable

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for a period greater than seven days. This is a condition which requires a Special Report as described in Technical Specification 3.13.H(2).

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Description of Occurrence:

On June 20,1997, the Stack RAGEMS High Range Monitor was removed from service and declared inoperable to allow a secondary calibration in accordance with the Master Surveillance Schedule. This surveillance had been on an escalated frequency (once per month) since a failure to successfully complete this test in September 1996. The surveillance was normally required every 20 months.

Recent test results were high, but still within the acceptable tolerances. On June 20,1997, the as found test results were high out of specification. The instrument was declared inoperable and trouble shooting commenced. Subsequently, it was determined that a new holding device utilized to properly position the test source during the calibration, reflected enough activity to affect the test results. The holding device was removed and a successful calibration was completed on June 28,1997. The Stack RAGEMS was returned to operability.

There are no Technical Specification required compensatory actions or limiting conditions for operation. However, the bases of the Technical Specifications state:

"The capability is provided to detect and . measure concentrations of noble gas fission products in... plant gaseous effluents...during and following an accident....These monitors augment the capabilities provided by the Post Accident Sampling System....The Post Accident Sampling System represents a preplanned alternate method to the high range radiation monitors..."

As the Post Accident Sampling System was fully operable at all times when required during this occurrence, the inoperability of this monitor has minimal safety significance.