ML20198S929
| ML20198S929 | |
| Person / Time | |
|---|---|
| Site: | Millstone  |
| Issue date: | 11/11/1997 |
| From: | Schopfer D SARGENT & LUNDY, INC. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| 9583-100, NUDOCS 9711140170 | |
| Download: ML20198S929 (2) | |
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Vice Presdent Project No. 9583-100 312 209-6078 Docket No. 50-423 Northeast Nuclear Ei.ergy Company Millstone Nuclear Power Station Unit 3 Independent Corrective Action Verification Program United States Nuclear Regulatory Commission Attention: Document Control Desk Washington, D.C. 20555 Tier 3 Past Change Revi;w - Setpoint Sample As part of the Tier 3 review of past plant changes, Sargent & Lundy has selected samples of review items based on a selection criteria developed by S&L and the NRC. In the area of setpoint changes the criteria, as adjusted by the NRC, recommended a sample of 40 setpoint changes for Unit 3. Ia a teleconference on Noverr5er 7,1997 with representatives frem the NRC, NU, and NEAC, S&L described the process through which it has attempted to obtain this sample. The following summarizes this process.
S&L initially requested a list of Unit 3 setpoint changes, and NU indicated that a list of f
setpoint changes is not maintained. S&L then decided to utilize the Master Setpoint Index (MSI) to facilitate the selection of a sample by selecting equipment / instruments important to plant safety from the MSI which were judged to have good potential for setpoint changes (instruments that are in potentially harsh environmental conditions or that monitor fi systems with potentially harsh process conditions). Of the 50 equipment / instruments Yg selected, DJ determined that only 3 had setpoint changes since plant start-up. An additionallist of 53 equipment / instruments was selected using the same approach, and from this list NU determined that 13 setpoint changes had occurred. In order to improve the success rate of finding setpoir.t changes, S&L then made an additional selection based on those setpoint calculations in the MSI that had multiple revision levels. Of the 52 samples selected in this manner, only 4 had changes in the se! points. Thus a sample of approximately 20 setpoint changes has been obtained, In light of the low number of setpoint changes that have occurred on Unit 3 since initial operation, we consider this sampic size to be suflicient and recommend that it be accepted for the Unit 3 ICAVP.
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United States Nuclear Regulatory Commission November 11,1997 Attention: Document Control Desk Page 2 Yours very truly,
}f-k D. K. Se opfer ICAVP Manager DKS:TJR:clk Copies:
E. Imbro, ICAVP Oversight T. Concannon, NEAC J. Fougere, NU T.J.Ryan File (M.\\U3itry' Corr \\97NR11Il.ds)
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