ML20012E499
| ML20012E499 | |
| Person / Time | |
|---|---|
| Site: | Haddam Neck File:Connecticut Yankee Atomic Power Co icon.png |
| Issue date: | 03/21/1990 |
| From: | Wang A Office of Nuclear Reactor Regulation |
| To: | Mroczka E CONNECTICUT YANKEE ATOMIC POWER CO. |
| Shared Package | |
| ML20012E500 | List: |
| References | |
| TAC-66948, NUDOCS 9004050272 | |
| Download: ML20012E499 (4) | |
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NUCLE AR REGULATORY COMMIS$lON 4
nweisestow, s. c. peau March 21,1990 Docket No. 50 213 Mr. Edward,1. Mroczka Senior Vice President Nuclear Engineering and Operations Connecticut Yankee Atomic Power Company Northeast Nuclear [nergy Company P. O. box 270 Hartford, Connecticut 06141 0270 Dear Mr. Mroczkat
$UBJECT: HADDAM NECK PLANT - REACTOR PROTECTION UPGRADE PHA5[ 1 (TAC NO. 66948)
During the 1987 refueling outage Connecticut Yankee Atomit Power Company CYAPC0startedthereplacementoftheoriginalanalogreactortrotection system (RPS) with state-of-the art digital equipment. CYAPC0 Ted decided i
to replace the RPS in several phases and determined that this upgrade could i
be done under 50.59. The staff decided to review CYAPCO's 50.59 determina-l tion and the acceptability of the RPS upgrade modifications related to Phase !.
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The NRC has completed its review of the Phase i portion of the RPS upgrade at the Haddam Neck Plant. As part of this review we performed an audit of the l
hardware and sof tware vendor (Foxboro) with you,r staff in attendance. This i
revisw will also expedite your Phase 11 review as Phase 11 will install the sane type of equipinent as used in Phase 1.
I The hKC staff concludes that the Phase 1 RPS modification is acceptable except j
that CYAPC0 has not demonstrated that the electrical environment of the new 4
eQuirrent is envelcred by the vendor's qualification testing.
Because Phase l
!! wt11 be complete before start-up for Cycle 16 and will add substantially l
more new nicroprocessor equipment, the NP.C staff requires that CYAPC0 submit a 1
progrett plan prior to restart describing the analysis, testing and schedule to
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tasolve this concern.
i The Itcenset has demonstrated that the equipment is functionally a one-for-one f
replacenent and does not result in a significant system level change, however, i
the staff considers that the differences in technology inherent in the new l
softwat e centro 11ed system present the possibilities for equipment malfunctions of a different type than previously evaluated. Malfunctions of a different type i
thee previously evaluated in equipment isnportant to safety is an unreviewed safety question. Digital microprocessors can malfunction in a different manner
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than the installed analog systems RPS and should not be installed via 10 CFR i
50.59.
Because several utilities have changed or are considering changing their analog systems with digital systerns, the staff is considering the issuance of additional guidance to the industry addressing the 50.59 issue for i
replacernent of analog with digital equipment. We expect this guidance will be i
available for you for any future modifications involving replacement of analog 1
equipment.
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2-A cery of our safety evaluation is enclosed.
If regarcirg this matter, please contact se at (301)yo,u have any questions 4 2 1313.
i Sincerely, I
N 434,i. van,1ectmana,er i
ProjectDirectorate14 j
Division of Reactor Projects. 1/11
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Office of Nuclear Reactor Regulation Inclosure:
As stateci cc w/er. closure:
See next page O
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k)E.J.Mroczka March 21, 1990 l
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,A copy of our safety evaluation is enclosed.
If regardirg this matter, please contact me at (301)you have any questions 492-1313.
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[i Division of Reactor Projects - 1/11 4
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Enclosure:
i As stated cc w/ enclosure:
i$ee next page
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Mr. Edward J. Mroczka Connecticut Yankee Atomic Power Company Haddam Neck Plant cc:
Gerald Garfield, Esquire R. M. Kacich, Manager Day, Berry and Howard Generation Facilit'es Licensing Counselors at Law Northeast Utilities Service Cospany l
City Place Post Office Box 270 Hartford, Cernecticut 06103-3499 Martford, Connecticut 06141-0270 W. D. Rotters, Vice President D. O. Nordquist Huclear Operations Director of Quality Services i
Northeest Utilities Service Company Northeast Utilities Service Company Post Office Box 270 Post Office tox 270 Hartford, Connecticut 06141-0270 Hartford, Cennecticut 06141 0270 l
Kevin McCarthy, Director Regional Administrator Radiation Control Unit Region !
Department of Environnental Protection U. $. Nuclear Regulatory Comission l
State Office Building 475 Allendale Road t
Hartford, Connecticut 06106 King of Prussia Pennsylvania 19406 l
Bradford S. Chase, Under Secretary Board of selectmen Er.ergy Division Town Hall Office of Policy and Mattagement Haddam, Connecticut 06103 t
80 Washingten Street Hartford, Connecticut 06106 J. T. Shedlosky, Resident Inspector Haddam Neck Plant t
D. B. Miller, Jr., Nuclear Station Director c/o V. S. Nuclear Regulatory Comission i
Haddam Neck Plant Post Office Box 116 i
Connecticut Yankee Atomic Power Company East Haddam Post Office RFD 1. Post Office Box 127E East Haddam Connecticut 06423 East Hampton, Connecticut 06424 G. H. Bouchard, Nuclear Unit Director Faddam Neck Plant Connecticut Yankee Atomic Power Company l
RfD 1. Fest Office Box 127E East Hempton, Connecticut 06424
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