ML19329B652

RO NP-09-77-02:on 770830,during Surveillance Test,Personnel Discovered That Weekly Gaseous Grab Sample from Station Vent Monitor Was Not Obtained.Caused by Component Failure. Stack Radiation Monitor Returned to Svc

ML19329B652
Person / Time
Site:	Davis Besse
Issue date:	09/26/1977
From:	TOLEDO EDISON CO.
To:
Shared Package
ML19329B563	List: ML19329B562 ML19329B652
References
NUDOCS 8002050761
Download: ML19329B652 (1)

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TOLEDO EDISON COMPANY DAVIS-BESSE UNIT ONE NUCLEAR POWER STATION

'd SUPPLDfENTAL INFORMATION FOR LER NP-09-77-2 DATE OF EV NT: August 30, 1977 FACILITY: Davis-Besse Unit 1 IDENTIFICATION OF OCCURRENCE: The weekly gaseous grab sample from the station vent monitor was not obtained. l I

Conditions Prior to Occurrence: The plant was in Mode 3, with Power (MWT) = 0 '

and Load (MWE) = 0.

Description of Occurrence: At 1000 hours0.0116 days <br />0.278 hours <br />0.00165 weeks <br />3.805e-4 months <br /> on August 30, 1977, while performing a routine surveillance test, ST 5099.06, " Effluent Radiological Monitoring", the Chemistry and Health Physics Tester discovered the net flow through the grab sample 3

flgwintegratorforthepreviousweekwasonly1ft ft net flow. The 1 ft3 of net flow was not enoughinstead of the normal to be considered 10,000 a legitimate sample; therefore, no grab sample was collected for the week of August 22, 1977 through August 29, 1977. This placed the station in violation of Environmental Technical Specification 2.4.4E which requires a weekly grab sample to be taken.

This event was erroneously thought to be reportable within 30 days. It was not N , determined to be reportable within 10 days until September 19, 1977, in the course of writing the report.

Designation of Apparent Cause of Occurrence: Component failur; is the cause of this occurrence. The grab sampler is permanently mounted only cn stack radiation monitor RE 2024 which was inoperable for the week. The redundant stack monitor RE 2025 does not have a grab sampler installed.

Analysis of Occurrence: There was no danger to the health and safety of the public or station personnel. The effluent released from the stack were continuously monitored and were below detactable levels.

Corrective Action: Stack radiation monitor RE 2024 was returned to service on September 3, 1977, returning the capability of obtaining weekly grab samples. A mcdification (T-2266) has been written to allow use of installed equipment on RE 2025 for an estimate of activity released if the incident re-occurs. Also, a Facility Change Request (FCR 77-314) has been written to request a grab sample unit be installed on RE 2025.

Failure Data: No previous similar events have occurred.

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