ML20207K924

RO 88-01:on 880725,during Inventory of Snm,Discrepancy Noted for Intermediate Range Monitor Detector Removed from Core Location C.Caused by Inadequage SNM Control & Accountability Practices Existing at Time of Installation & Shipment

ML20207K924
Person / Time
Site:	Browns Ferry
Issue date:	10/07/1988
From:	Campbell G TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM)
References
88-01, 88-1, NUDOCS 8810170082
Download: ML20207K924 (3)

Text

R42 881006 921

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TENNESSEE VALLEY AUTHORITY Browns Ferry Nuclear Plant Post Office Box 2000 Decatu6 , Alabama 35602 OCT 07 gggg September 30, 1988 U.S. Nuclear Regulatory Commission Document Control Desk Washington, D.C. 20555

Dear Sir:

TENNESSEE VALLEY AUTHORITY - BROWNS FERRY NUCLEAR PLANT UNITS 1, 2, & 3 - DOCKET NOS. 50-259, 260, and 296 - FACILITY OPERATING LICENSES DPR-33, 52, AND 68 The enclosed report provides details concerning a record discrepancy on nonfuel special nuclear material. This is a voluntary information report.

Very truly yours, l TENNESSEE VALLEY AUTHORITY SQ&

Guy G. Campbell Plant Manager Browns Ferry Nuclear Plant RM:RDE:SBJ:ADG Enclosures cc (Enclosures):

RIMS, MR AN 72A-C Regional Administration INPO Records Center U.S. Nuclear Regulatory Commission Suite 1500 Office of Inspection and Enforcement 1100 Circle 75 Parkway Region II Atlanta, Georgia 30339 101 Marietta Street, Suito 2900 Atlanta, Georgia 30303 NRC Resident Inspector, Browns Ferry Nuclear Plant 8810170002 801007 PDR ADOCK 05000260 }

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An Equal Opportunity Employer

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SPECIAL REPORT 88-01 SPECIAL NUCLEAR MATERIAL INVENiORY DISCREPANCY On July 25, 1988, following the replacement of four unit 2 intermediate range monitor (IRM) detectors, a physical inventory was conducted in the designated item control area (ICA) for Special Nuclear Material (SN?: stored in radwaste. During a review of the inventory results a discrepancy was notou for the IRM detector removed from the IRM 'C' core location. The history forms indicated that IRH detector TAECY7-001 was supposed to have been in this core location. The physical inventory revealed that IRM detector 6607749 was removed from this core location.

The history forms indicate that IRM detectvr 6607749 had been shipped to another licensed facility in 1983.

The discrepancies were caused by inadequate SNM control and accountability practices which existed at the time the installation and shipment events took place. ihe inadequate accountability practices were previously identified by the NRC in in1pection reports 86-38 and 87-29. The discovery of the discrepancy described in this report is a direct result of the SUM control and accountability system developed in response to the NRC reports. Details and results of the nonfuel SNM records search which were used to develop the present history forms are contained in TVA's letter to the NRC dated September 30, 1987. Due to the lack of available documentation, some assumptions had to be made regarding transfers of SUM in previous years.

A review of old history forms, maintenance requests, and purchases from power stores was initiated to determine the correct storage location of the IRM detectors associated with the discovered discrepancy. Records indicate that IRM detector TAECY7-001 was taken from power stores for use in replacing the unit 2 IRM channel

'C' on March 13, 1986. The fact it was not found in this location when the i detector in this channel again needed replacing, leads us to believe the detector l TAECY7-001 was f ound to be unacceptable for uFe and placed in radWaste. I RM l detector 6601749 was then put in channel 'C' on March 13, 1986. Because it had been assumed detector 6607149 was one of the two IRMs shipped to another licensed facility in June, 1983, the question then arises as to the identity of the second detector shipped to the other licensee. The licensee has confirmed possession of IRM detector THHHA2-019. Shipping records indicate that two IRMs were shipped to the licensee in June 1983, but the records do not identify the serial numbers of the detectors shipped. The other licensee shipped two IRMs to Browns Ferry in February,1984, as replacements for the IRMs shipped to them in 1983. TAECY1-001 was one of the detectors recolved from the other licensee in 1984, so we know it was not one of the detectors shipped to them in 1983. A list was complied of all IRM detectors known to have been available for shipment to the other licencee in June of 1983. The locatior, of each of the detectors on the list has been verified in subsequent physical inventories, so the search then focused on inconsistencies in the previous history records for clues to the identity of the second IRM detector shipped to the other licensee,

Page 2 Questionable entries and changes made to the old history forms lead us to believe that IBM detector 6344763 was the other IRM shipped to the other licensco in 1983. IRM detector TAECY7-001 was apparently unacceptable for use and was sent to radwasto. We now know IRM detector 6607749 was not shipped to the other licensee, but was placed in the unit 2 reactor in the 'C' IRM core location.

As in-core detcetors are replaced, we will continue to confirm and undate our present history forms to make them as accurato as possible. There are no indications that total number of IRMs thought to have been at Browns Ferry has changed from those values presented in our September 30, 1987 letter to the NRC.

The serial numbers of the detectors removed from the reactor gave us some new informsLion enabling us to more occurately reconstruct tht., history of nonfuel SNM at Browns Ferry.

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