ML20149N000
| ML20149N000 | |
| Person / Time | |
|---|---|
| Site: | Millstone  |
| Issue date: | 02/22/1988 |
| From: | Kane W NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| To: | Mroczka E NORTHEAST NUCLEAR ENERGY CO. |
| Shared Package | |
| ML20149N001 | List: |
| References | |
| EA-88-061, EA-88-61, NUDOCS 8802290369 | |
| Download: ML20149N000 (2) | |
See also: IR 05000423/1988003
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Docket / License:
50-423/NPF-49
fEA 88-61
Northeast Nuclear Energy Company
ATTN: Mr. Edward J. Mroczka
Senior Vice President, Nuclear
Engineering and Operations
,
P.O. Box 270
'
Hartford,. Connecticut
06101-0270
Gentlemen:
Subject: Millstone 3 Special Inspection 50-423/88-03 (1/19-29/88)
The enclosed report transmits the findings of the January 19-29, 1988 special in-
spection concerning an overpressure event at low temperature. These findings were
discussed by Mr. W. Raymond of this office with Mr. C. Clement of your staff on
February 18, 1988.
On January 19, 1988, the NRC was informed of the everpressura ' event and your in-
tention to investigate it.
On January 22, 1988, our inspector found that the re-
quired overpressure protection systems had not been available to protect against
the transient.
This event involved exceeding a Limiting Condition for Operation
.
(LCO) and an actual challenge to the unavailable overpressure protection systems.
The operators incorrectly believed that the power operated relief valves (PORVs)
had been operable at their low temperature overpressure setpoint since 9:10 p.m.
on January 16, 1988. This inspection found that no automatic actuation low tem-
perature overpressure protection (LTOP) equipment was available on January 19, 1988
for 16 minutes during which an overpressure condition occurred.
Prompt and effec-
tive operator action mitigated the event.
10 CFR 50 Appendix G limits were not
exceeded. Returning one operable Residual Heat Removal (RHR) suction relief valve
to service after 16 minutes provided one low temperature overpressure protection
feature. However, full compliance with the LTOP LC0 was not achieved for four
hours and 40 minutes, when the low temperature overpressure relief setpoint was
made operable for the PORVs. We are concerned with the event itself and the lack
of equipment control and status indication that contributed to it.
Accordingly,
we are scheduling an enforcement conference to discuss this event with you in the
NRC Region I Office in King o.f Prussia. We will forward an appropriate notifica-
tion of enforcement action after the enforcement conference.
During the enforcement conference, pleast be prepared to address the following:
Safety significance.
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Root cause evaluation.
--
Factors that worsened or mitigated this event.
--
Broader implications of this event.
--
.
Actions to prevent recurrence.
--
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8802290369 880222
ADOCK 05000423
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JFICIAL RECORD COPY
DL50-423/88-03 - 0001.0.0
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Matters listed in Section 8 of the enclosed report.
--
Thank you for your cooperation.
Sincerely,
oricinal EiSne d By:
'
William F. Kane, Director
Division of Reactor Projects.
Enclosure: NRC Region I Inspection Report 50-423/88-03
cc w/ enc 1:
Mr. W. D. Romberg, Vice President, Nuclear Operations
Mr. S. E. Scace, Station Superintendent
Mr. R. M. Kacich, Manager, Generation Facilities Licensing
Mr. D. O. Nordquist, Director of Quality Services
Public Document Room (PDR)
local Public Document Room (LPDR)
Nuclear Safety Information Center (NSIC)
NRC Senior Resident Inspector
State of Connecticut
bec w/ encl:
Region I Docket Room (with concurrences)
Management Assistant, DRMA (w/o enclosures)
C. Y. Cheng, NRR
J. Lieberman, OE
F. Miraglia, NRR
J. Goldberg,~0GC
D. Holody, RI
W. Kane, RI
S. Collins, RI
L. Bettenhausen, RI
E. McCabe, RI
S. Pindale, RI, Beaver Valley
W. J. Raymond, SRI, Millstone 1, 2, & 3
R. Ferguson, LPM, NRR
Robert J. Bores, DRSS
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