ML20197J919

Documents Operating Reactors Assessment Branch Review of Operating Experience for Facility During Low Power License Period.Operating Experience Appears to Be More Favorable than That at Other Recently Licensed Plants

ML20197J919
Person / Time
Site:	05000000, Diablo Canyon
Issue date:	06/24/1985
From:	Crutchfield D Office of Nuclear Reactor Regulation
To:	Novak T Office of Nuclear Reactor Regulation
Shared Package
ML082840462	List: ML20197J561 ML20197J565 ML20197J706 ML20197J711 ML20197J756 ML20197J770 ML20197J799 ML20197J806 ML20197J819 ML20197J838 ML20197J887 ML20197J893 ML20197J911 ML20197J919 ML20197J925 ML20197J939 ML20197J949 ML20197J973 ML20197J987 ML20197J997 ML20197K022 ML20197K029 ML20197K052 ML20197K055 ML20197K065 ML20197K070 ML20197K126 ML20197K130 ML20197K136 ML20197K144 ML20197K155 ML20197K164 ML20197K170 ML20197K198 ML20197K221 ML20197K228 ML20197K243 ML20198A020 ML20198A192 ML20198A211 ML20198A219 ML20198A225 ML20198A249 ML20198A254 ML20198A262 ML20198A359 ML20198D828 ML20198G197 ML20198G219 ML20198G265 ... further results
References
FOIA-86-197 NUDOCS 8507030678
Download: ML20197J919 (2)

Text

--

Q.

i

/

'o,,

UNITED STATES NUCLEAR REGULATORY COMMISSION o

h WASHINGTON, D. C. 20555

%,,,,+

$ 2 1 BBS MEMORANDUM FOR:

Thomas M. Novak, Assistant Director for Licensing, DL FROM:

Dennis M. Crutchfield, Assistant Director for Safety Assessment, DL

SUBJECT:

DIAPLO CANYON UNIT 2 OPERATING EXPERIENCE This memorandum documents the Operating Reactors Assessment Branch's review of operating experience for Diablo Canyon 2 during the low power license period.

The low power license period considered in this survey extended from April 26, 1985 to June 21, 1985. During the nearly two month period, there were no events at the plant which were reportable under 10 CFR 50.72, nor were iny LERs issued. Numerical results from this survey are compared with those from other recently licensed plants in Table 1.

Poth the number and frequency of reportable events for Diablo Canyon 2 during low power operation are below average. The data may be somewhat inconclusive, due to the short period of time and lack of operation outside of Pode 5.

Conclusion Based on this survey of low power operating experience for Diablo Canyon 2 and a comparison with other plants, we conclude that operating experience at Diablo Canyon 2 appears to be more favorable than that at other recently licensed plants.

• k-en is M. Cru ch 1,d, Assistant Director for Safety Asse sment, OL

Enclosure:

As stated CONTACT:

W. Swenson, ORAB x27876

+

l O

s.

I L

ENCLOSURE TABLE 1 RATE OF REPORTED EVENTS AT TEN SELECTED UNITS DURING LOW POWER LICENSE PERIOD Period of Low Power Rate of Reported Events Operation Studied (Avg. No. Reports / Month)

Facility (Months) 50.72 LER*

PWR Callaway Unit 1 3.0 9

10 Catawaba Unit 1 6.0 5

5 Byron Unit 1 1.6 15**

15 Waterford Unit 3 3.0 7

2 Palo Verde Unit 1 4.5 8**

5 l

1 Wolf Creek 2.5 11**

13 Diablo Canyon 2

?.0 0

0 Average: 7 PWRs 8

7 BWR Susquehanna Unit 2 3.0 2

3 Limerick 1 2.8(1) 18 17 Limerick 1 3.0(2) 9 19 Fermi 2 3.0 8

9 Average: 3 BWRs 8

9

• Does not include reports from last 30 days of period due to delay in reporting

• • Majority of reports are reoccurrence of two particular problems (1) Period is from October 26, 1984 to January 17, 1985

( P.) Period is from January 17, 1985 to April 15, 1985 t