ML20046C820
| ML20046C820 | |
| Person / Time | |
|---|---|
| Issue date: | 07/02/1993 |
| From: | Pulsifer R Office of Nuclear Reactor Regulation |
| To: | Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 9308120231 | |
| Download: ML20046C820 (5) | |
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NUCLEAR REGULATORY COMMISSION ggw.,/
54 WASHINGTOts. D.C. 20555-0001 July 2, 1993 ORGANIZATION: NUCLEAR MANAGEMENT AND RESOURCES COUNCIL (NUMARC)
SUBJECT:
MEETING
SUMMARY
- DISCUSSION OF NRC MARKUP OF NUMARC DRAFT DOCUMENT " GUIDELINE FOR LICENSING DIGITAL 1&C UPGRADES" On June 23, 1993, a meeting was held at NRC Headquarters in Rockville, Maryland, to discuss the June 2,1993, NRC markup of the NUMARC draft document entitled " Guideline for Licensing Digital I&C Upgrades."
Meeting participants included representatives of NUMARC, various utilities and consultants, and employees of the NRC's Office of Nuclear Reactor Regulation (NRR).
A list of attendees is enclosed.
NUMARC stated the prime reason for this meeting was to discuss the NRC markups to understand the reasoning behind them.
NUMARC asked why a threshold was needed.
The NRC said that a threshold was desired to indicate those Analog to Digital (A/D) changes that would probably need NRC review before implementation. This does not alleviate the responsibility or authority of the licensee to perform a 10 CFR 50.59 evaluation in every case, nor does it predetermine the outcome of that evaluation.
NUMARC indicated that they received about twenty five comments on the draft document.
Some of the comments dealt with 1) needing examples of complex systems, 2) document should focus on systems vs component failure modes, 3) commercial grade items should be more specifically addressed and 4) address the difference in handling complete Reactor Protection System upgrade vs a minor upgrade modification to a safety system.
Several items were discussed regarding the markups:
The safety significance of the upgrade will determine if the item is above or below the threshold. This could be a major system upgrade to a minor instrument change. An unreviewed safety question (USQ) determination requires NRC review and approval before implementation.
An NRC review is not required because the upgrade just involves digital equipment but a review is required because of the uncertainties associated with the more complex software, i.e., testing, electromagnetic interference (EMI), and verification and validation (V&V) lead to an USQ.
This document will not use the word "shall" because it is only a guideline for licensee use.
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_2-Good EMI data is not available. Knowledge of the EMI environment in which the upgraded equipment is expected to operate should be obtained as well as its effect on other equipment, j
Dedication of commercial grade software for complex systems is difficult. Verification and validation of source codes may be necessary. There needs to be a high degree of confidence that the product will perform as intended and that no unintended functions will occur.
It is difficult to quantify software probabilities.
NRC would probably reduce review time needed for similarly approved devices or upgrades that reference previously approved designs, such as by a topical report. The NRC would then focus on plant specific issues, such as environmental effects and operating experience.
NUMARC stated that after their review and resolution of the NRC and industry comments on the draft document the final guideline should be ready by fall.
ORIGINAL SIGNED BY:
Robert M. Pulsifer, Project Manager Project Directorate III-3 Division of Reactor Projects III/IV/V Office of Nuclear Reactor Regulation
Enclosure:
List of attendees OFFICE PDlIIr3:LA:DRPW PDIII-3:PM:DEp}I HICB-NAME MRusbrk RPulsifd/
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/ / $93 7 / 2 /93 7 / 2 /93 DATE 0FFICE PDIII-3:PD:DRPW JHNn /s NAME DATE 7 / 7_ /93 Document Name:
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July 2, 1993 i
DISTRIBUTION
- Central File-l NRC PDR PDIII-3 r/f l
TMurley/Miraglia JPartlow JRoe
-i BBoger JZwolinski JHannon RPulsifer Ploeser (8-H3)
CLittle (P-351)-
l JStewart (8-H-3)
CDoutt (8-H-3)
JGallagner (8-H-3)
JJoyce (8-H-3)
FAllenspan (10-A-19) i GScarfo (MNBB-3206)
RKarsch (MNBB-3206)
JWermeil (10-D-24)
JMauck (8-H-3) l RGallo (10-D-22)
MRushbrook OGC EJordan (MNBB-3206)
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GGrant (17-G-21) i EGreenman,RIII I
ACRS (10)
SMays (P-315)
DWheeler (12-G-18)
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MPR Associates MPR Associates ATTN: Jess Betlack ATTN:
Bob Fink 320 King Street 320 King Street Alexandia, Virginia 22314 Alexandia, Virginia 22314 EPRI Scott Wingate l
ATTN:
Ray Torok NUS Safety & Licensing
.i P. O. Box 10412 910 Clopper Rd.
5 Palo Alto, California 94303 Gaithersburg, Maryland 20878-1399 l
i Tony Pietrangelo Mr. David Reigel NUMARC GE Nuclear Energy 1776 Eye Street, NW 175 Curtner Avenue Suite 300 MK 236 Washington, DC 20006-3706 San Jose, California 95125 Dave Modeen Mr. Hector Barbeito NUMARC Bechtel PWR Corporation 1775 Eye Street, NW 9801 Washington Blvd.
Suite 300 Gaithersburg, Maryland 20878 Washington, Dc 20006-3705 Commonwealth Edison Company ATTN:
Richard Blauw 125 S. Clark - Room 422 Chicago, Illinois 60603 Bechtel PWR Corporation ATTN:
Kevin Granev 9801 Washingtonian Blvd.
Gaithersburg, Maryland 20878 J
Mr. Michael Hellums TVA 1101 Market Street Chattonooga, Tennessee 37401 l
Mr. Gerry von Noordennan Northeast Utilities P.O. Box 270 Hartfield,-Connecticut 06141-0270 Mr. Lloyd Heckle Duke Power 2086 High Pines i
Rock Hill, South Carolina 29732 i
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' Enclosure 1 ANALOG TO DIGITAL MEETING ATTENDANCE June 23, 1993
!GME ORGANIZATION TELEPHONE i
Robert Pulsifer NRR/PD III-3 (301) 504-3016 Kevin Graney SERCH Licensing-Bechtel (301) 417-8823 Hector Barbeito SERCH Licensing-Bechtel (301) 417-8142 Scott Wingate NUS (301) 258-2565 Cliff Doutt NRR/HICB (301) 504-2847 Paul Loeser NRR/HICB (301) 504-2825 Jerry Mauck NRR/HICB (301) 504-3248 Duke Wheeler NRC/0E00 (301) 504-1717 7
Bruce Boger NRR (301) 504-1004' Robert Gallo NRR (301) 504-2548 Doug Coe NRC/ACRS (301) 492-8972 i
Steven Mays NRC/ACRS (301) 492-7904 i
John Hannon NRR/DRPW (301) 504-1389 Tony Pietrangelo NUMARC (202) 872-1280 Bob Fink MPR Associates (703) 519-0200 Ray Torok EPRI (415) 855-2776 Dave Modeen NUMARC (202) 872-1280 Dave Reigel GE Nuclear (408) 925-2094 Jess Betlack MPR Associates (703) 519-0200 Richard Blauw Commonwealth Edison Co. (312) 394-8893 i
Gerry van Noordennen Northeast Utilities (203) 665-3288 L?oyd Heckle Duke Power (704) 382-3730 Mike Hellums TVA (615) 751-2695 a