ML18100A476
| ML18100A476 | |
| Person / Time | |
|---|---|
| Site: | Salem  |
| Issue date: | 07/09/1993 |
| From: | Stone J Office of Nuclear Reactor Regulation |
| To: | Boyle M Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 9307190265 | |
| Download: ML18100A476 (5) | |
Text
Docket Nos. 50-272 and 50-311 July 9, 1993 ~
MEMORANDUM FOR:
Michael L. Boyle, Acting Director Project Directorate I-2 Division of Reactor Projects - I/II Office of Nuclear ReactGr Regulation FROM:
James C. Stone, Senior Project Manager Project Directorate I-2 Division of Reactor Projects - I/II Office of Nuclear Reactor Regulation
SUBJECT:
DIGITAL FEEDWATER CONTROL SYSTEM, SALEM NUCLEAR GENERATING STATION, UNITS 1 AND 2 DATE & TIME:
July 19, 1993 10:00 a.m.
LOCATION:
Salem Nuclear Generating Station Processing Center Room 1 Public Service Electric and Gas Company Hancocks Bridge, New Jersey PURPOSE:
To discuss questions concerning the digital feedwater control system (see attached agenda).
PARTICIPANTS*:
NRC
Enclosure:
Meeting Agenda cc w/enclosure See next page J. Stone S. Athavale R. Skokowski H. Onorato M. Metcalf M. Bursztein
/SI L. Rajowski C. Waite James C. Stone, Senior Project Manager Project Directorate I-2 Division of Reactor Projects - I/II Office of Nuclear Reactor Regulation
- Meetings between NRC technical staff and applicants or licensees are open for interested members of the public, petitioners, intervenors, or other parties to attend as observers pursuant to "Open Meeting Statement of NRC Staff Policy," 43 Federal Register 28058, 6/28/78.
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UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555-0001 July 9, 1993 MEMORANDUM FOR:
Michael L. Boyle, Acting Director Project Directorate I-2 Division of Reactor Projects - I/II Office of Nuclear Reactor Regulation FROM:
James C. Stone, Senior Project Manager Project Directorate I-2 Division of Reactor Projects - I/II Office of Nuclear Reactor Regulation
SUBJECT:
DIGITAL FEEDWATER CONTROL SYSTEM, SALEM NUCLEAR GENERATING STATION, UNITS 1 AND 2 DATE & TIME:
July 19, 1993 10:00 a.m.
LOCATION:
PURPOSE:
Salem Nuclear Generating Station Processing Center Room 1 Public Service Electric and Gas Company Hancocks Bridge, New Jersey To discuss questions concerning the digital feedwater control system (see attached agenda).
PARTICIPANTS*:
NRC
Enclosure:
Meeting Agenda cc w/enclosure See next page J. Stone S. Athavale R. Skokowski H. Onorato M. Metcalf M. Bursztein L. Rajowski C. Waite
~*c~
James C. Stone, Senior Project Manager Project Directorate I-2 Division of Reactor Projects - I/II Office of Nuclear Reactor Regulation
- Meetings between NRC technical staff and applicants or licensees are open for interested members of the public, petitioners, intervenors, or other parties to attend as observers pursuant to "Open Meeting Statement of NRC Staff Policy," 43 Federal Register 28058, 6/28/78.
I Public Service Elect~ & Gas Company cc:
Mark J. Wetterhahn, Esquire Winston & Strawn 1400 L Street NW Washington, DC 20005-3502 Richard Fryling, Jr., Esquire Law Department - Tower SE 80 Park Place Newark, NJ 07101 Mr. Calvin A. Vondra General Manager - Salem Operations Salem Generating Station P.O. Box 236 Hancocks Bridge, NJ 08038 Mr. J. Hagan Vice President - Nuclear Operations Nuclear Department P.O. Box 236 Hancocks Bridge, New Jersey 08038 Mr. Thomas P. Johnson, Senior Resident Inspector Salem Generating Station U.S. Nuclear Regulatory Commission Drawer I Hancocks Bridge, NJ 08038 Dr. Jill Lipoti, Asst. Director Radiation Protection Programs NJ Department of Environmental Protection and Energy CN 415 Trenton, NJ 08625-0415 Maryland People's Counsel American Building, 9th Floor 231 East Baltimore Street Baltimore, Maryland 21202 Mr. J. T. Robb, Director Joint Owners Affairs Philadelphia Electric Company 955 Chesterbrook Blvd., 51A-13 Wayne, PA 19087 Mr. Steven E. Miltenberger Vice President and Chief Nuclear Officer Public Service Electric and Gas Company Post Office Box 236 Hancocks Bridge, New Jersey 08038 Salem Nucle~Generating Station, Units 1 and 2 Richard Hartung Electric Service Evaluation Board of Regulatory Commissioners 2 Gateway Center, Tenth Floor Newark, NJ 07102 Regional Administrator, Region I U. S. Nuclear Regulatory Commission 475 Allendale Road King of Prussia, PA 19406 Lower Alloways Creek Township c/o Mary 0. Henderson, Clerk Municipal Building, P.O. Box 157 Hancocks Bridge, NJ 08038 Mr. Frank X. Thomson, Jr.,
Licensing and Regulation Nuclear Department P.O. Box 236 Hancocks Bridge, NJ._08038 Mr. David Wersan Assistant Consumer Advocate Office of Consumer Advocate 1425 Strawberry Square Harrisburg, PA 17120 Mr. J. A. Isabella Manager MGR. - Generation Department Atlantic Electric Company P.O. Box 1500 1199 Black Horse Pike Pleasantville, NJ 08232 Carl D. Schaefer External Operations - Nuclear Delmarva Power & Light Company P.O. Box 231 Wilmington, DE 19899 Public Service Commission of Maryland
. Engineering Division ATTN:
Chief Engineer 231 E. Baltimore Street Baltimore, MD 21202-3486
AGENDA FOR JULY 19, 1993 MEETING
- 1. Questions about Procedure NC.NA-AP.22-0054(Q), Rev. 1
- a.
The procedure doesn't provide much guidance with respect to post modification testing of software.
For instance, the procedure only refers to requirement tracing and doesn't mention static and dynamic testing. This is important because there are many different potential errors that can only be detected with a particular type of testing (i.e., requirement tracing, static, and dynamic).
- b.
The procedure describes that the post modification tests are developed in the work plan by the assigned engineer and only witnessed by the Verification and Validation (V&V) Group.
How will this ensure adequate independence from the software design?
Why isn't the V&V Group involved in the development of the post modification tests?
- 2.
Questions about WCAP-11313
- a.
WCAP-11313 only addresses radioactive EMI and doesn't addr~ss conductiv~~
EMI.
Since digital equipment is also susceptible to conductive EMI, what type of testing was performed on the MSS to ensure that it will operate satisfactorily if subjected to conductive EMI?
- b.
WCAP-11313 describes at least six cases where the O/P signals are degraded to bad signals between 66 and 74 MHz or between 66 to 86 MHz, including at least one case where the O/P signal goes to zero temporarily at 74 MHz.
A bad signal is defined as a signal that has increased or decreased beyond the specified limits.
Why is this acceptable for satisfactory operations of the MSS?
- 3. State of New Jersey Questions PSE&G recently experienced problems with the Salem, Unit 2 rod control system supplied by Westinghouse. This is the subject of NRC Information Notice 93-46 and resulted in an NRC Augmented Inspection Team Investigation.
The BNE is concerned that the advanced digital feedwater control system may be susceptible to electronic failures similar to those experienced in the rod control system.
Once the causes of failure in the rod control system are completely understood and corrected, a detailed review of the design of the feedwater control system must be performed to assess the system's ability to withstand voltage spikes or any other anomaly identified to be a contributing cause of the rod control failures.
DI STR IBUTI ON
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NRC & Local PDRs PDI-2 Reading T. Murley/F. Miraglia J. Partlow S. Varga J. Calvo M. Boyle J. Stone M. O'Brien A. Chaffee, OEAB OGC E. Jordan E. Rossi Receptionist (OWFN)
S. Athavale R. Skokowski ACRS(lO)
OPA NRR Mailroom, PMAS, 12/G/18 P. 0' De 11, PMAS G. Zech, RPEB V. Mccree, EDO E. Wenzinger, RGN-I J. White, RGN-I K. Abraham/D. Screnci, Region I cc:
Licensee & Service List