ML20136F970
| ML20136F970 | |
| Person / Time | |
|---|---|
| Site: | Limerick, 05000000 |
| Issue date: | 04/26/1985 |
| From: | Crutchfield D Office of Nuclear Reactor Regulation |
| To: | Novak T Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML20136E841 | List: |
| References | |
| FOIA-85-668 NUDOCS 8505030651 | |
| Download: ML20136F970 (4) | |
See also: IR 05000117/2004015
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UNITED STATES
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APR 2 61985
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MEMORANDUM FOR:
Thomas M. Novak, Assistant Director
for Licensing, DL
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FROM:
Dennis M. Crutchfield, Assistant Director
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for Safety Assessment, DL
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SUBJECT:
UPDATE OF LIMERICK-1 OPERATING EXPERIENCE
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This memorandum updates our previous review of operating experience at
Limerick-1. The previous review (memorandum enclosed) included a survey of
reported events at Limerick-1 for the period between October 26, 1984 and
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January 17, 1985. This review update covers the period between January 17,
1985 and April 15, 1985.
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. . . _
'S'urvey of Experience
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In the past three months of the low power license period (i.e. January 17,
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1985 through April 15,1985), twenty-six non-security events have been
reported to the NRC Operations Center per 10 CFR 50.72
In addition,
seventeen Licensee Event Reports (LER) have been filed per 10 CFR 50.73 in
the first one-and one half months of the update period. These figures
translate to a frequency of reported events between nine and twelve events
per month. This reflects a significant reduction from the frequency of
eighteen events per month identified in the first three months of the low
power license period (see attached report).
Limerick event frequencies for
the first and subsequent three month period of the low power license are
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compared with one another and with frequencies for other recently licensed
BWRs and PURs in Table 1.
As in the initial survey period, the vast majority of reported events have
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been inadvertent actuations of emergency safety features principally
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involving the Control Room and Reactor Building Ventilation Isolation
features, and the Reactor Water Clean-up System. Personnel errors played a
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significant role in about one-third of the reported events. This is signifi-
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cantly less than the share involving personnel errors identified in the first
three months of the low power license period, which was a little over
one-half. A breakdown of reported events is presented in Table 2.
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APR 2 61985
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Our review of significant events presented at Operating Reactors Event
Briefings indicates that no Limerick events were discussed 'in the past three
months of the low power license period.
Conclusion
Operating experience at Limerick-1 has been surveyed for the past three
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months of the low power license period and compared with experience in the
first two and three quarter months of the low power license period and with
similar experience at other recently licensed BWRs and PWRs. The review
indicates that the frequency of reportable events at Limerick is still
somewhat higher than expected during initial start-up, but has decreased
significantly from that observed in the first few months of the low power
license period. Initiatives taken by Region I and the licensee to reduce the
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event frequency appear to be working effectively.
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This review required approximately 20 manhours to complete.
Y
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&
Denn
M.
tchfield, Assistant Director
for Safety Assessment, DL
cc:
R. Martin
A. Schwencer
R. Gallo, Reg. I
J. Wiggins, Reg. I
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TABLE 1
RATE OF REPORTED EVENTS AT
TWELVE SELECTED PLANTS
DURING LOW POWER LICENSE PERIOD
Period of Low Power
Rate of Reported Events
~
Operation Studied
(Avg. No. Reports / Months)
Facility
(Months)
50.72
LER**
Diablo Canyon
5
4
4
McGuire Unit 2
3
1 -2
1-2
Sumer Unit
3
1
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14
Callaway Unit 1
3
9
10
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Catawba Unit 1
6
5
5
Byron Unit 1
1.5
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15
Waterford ilnit 3
3
7
2
,
Grand Gulf
21
10
18*
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LaSalle Unit 1
4
1
19*
Susquehanna Unit 1
4
3
12
Susquehanna Unit 2
3
2
3
Limerick 1
2.75(1)
18
17
Limerick 1
3(2)
9
12
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- Includes data from before 1/1/84,50.73 LER Rule
- Does not include reports from last 30 days of period due to delay
in reporting
- Majority of reports are reoccurrence of two particular problems
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(1) Period is from October 26, 1984 to January 17, 1985
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(2) Period is from January 17, 1985 to April 15, 1985
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TABLE ?
BREAKDOWN OF REPORTED EVENTS
AT LIMERICK-1
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No. of Reported Events *
General Category
(10/26/84 - 1/17/85) & (1/17/85 - 4/15/85)
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Technical Specification Violation
8
3
Degradation of Safety Equipment
3
3
Procedural and Operational Errors
0
2
Minor chemical releases
0
2
RPS Actuations
Actual -Chr11enges
0
0
Inadvertent actuations
2
1
. due to personnel error
Inadvertent actuations
3
3
due to equipment problems
ESF Actuations
Actual challenges
0
0
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Ina'dvertent Actuations
due to personnel error
22
4
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Inadvertent Actuations
due to equipment problems
20
14
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TOTAL
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37
2
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- This is total number of unique events reports made through either ENS
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(50.72) or LER.
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