ML16341F727
| ML16341F727 | |
| Person / Time | |
|---|---|
| Site: | Diablo Canyon  |
| Issue date: | 05/24/1990 |
| From: | Richards S NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| To: | Shiffer J PACIFIC GAS & ELECTRIC CO. |
| Shared Package | |
| ML16341F728 | List: |
| References | |
| NUDOCS 9006120011 | |
| Download: ML16341F727 (6) | |
See also: IR 05000275/1990008
Text
lÃAY 2 4
]ggg
Docket Nos.
50-275
and 50-323
Pacific
Gas
and Electric Company
77 Beale Street,
Room 1451
San Francisco,
California 94106
Attention:
Mr. J.
D. Shiffer, Senior Vice President
and General
Manager
Nuclear
Power Generation
Gentlemen:-
Subject:
NRC Inspection of Diablo Canyon Units 1 and
2
This refers to the routine inspection
conducted
by Messrs,
P.
P.
Narbut and
K.
E. Johnston
during the period of March 11 through April 21,
1990.
This
inspection
examined your activities
as authorized
by
NRC License
Nos.
and
At the conclusion of the inspection,
discussions
of their
findings were held with Mr. J.
D.
Townsend
and other members of your staff.
Areas
examined during this inspection
are described
in the enclosed
inspection
report.
Within these
areas,
the inspection consisted of selective
examinations
of procedures
and representative
records,'nterviews
with
person"el,
and observations, by the inspectors.
Based
on the results of this inspection, it appears
that one of your
activities was not conducted
in full compliance with NRC requirements,
as set
forth in the Notice of Violation, enclosed
herewith as Appendix A.
Your
response
to this notice is to be submitted in accordance
with the provisions
of 10 CFR 2.201
as stated
in Appendix A, Notice of Violation.
The enclosed
report describes
several
occurrences
where the significance or
scope of applicability of technical
issues
were apparently
not fully thought
out initially.
Examples include:
Failure to maintain the Fuel Handling Building Ventilation System barrier
doors closed
such that the system could establish
the required negative
pressure.
Engineering
reviews in 1989 recognized
the need to control the
system barrier, but then only considered
a limited number of openings in
the barrier.
Improper blowdown settings of several relief valves,
which were
identified during the Unit 1 outage in October to December,
1989, yet the
full extent of the issue
as it applied to other relief valves in the
plant was not determined until March,
1990.
Failure to evaluate .and correct
a problem identified with an Auxiliary
System
check valve during the second refueling outage of Unit
2.
During the third refueling outage,
the valve was found stuck open
during maintenance,
and then the problem subsequently
was fully
addressed.
Excessive
leakage
past three Unit 2 Residual
Heat
Removal
valves not
being fully assessed
when discovered
during the outage
and not being
promptly brought to the attention of management.
Problems with the operation of the Fuel Handling Building Brid~e Crane
during the Unit 2 outage,
which were not brought to management
s
attention
and were addressed
in a weakly coordinated
manner.
Although none of the above
examples
resulted in a significant safety issue,
these
examples
indicate that plant problems
are not always being fully and
promptly assessed.
- In accordance
with 10 CFR 2.790 (a),
a copy of this letter and the enclosures
will be placed in the
NRC Public Document
Room.
The responses
directed
by this letter are not subject to the clearance
procedures
of the Office of Management
and Budget as required
by the Paperwork
Reduction Act of 1980,
PL 96-511.
Should you have
any questions
concerning this inspection,
we will be pleased
to discuss
them with you.
Sincerely,
S.
A. Richards,
Chief
Reactor Projects
Branch
Enclosures:
1.
Appendix A, Notice of Violation
2
~
Inspection
Report
Nos.
50-275/90-08
and 50-323/90-08
cc w/enclosure:
J.
A. Sexton,
PG8:E
R.
F.
Locke,
PGLE
J.
D. Townsend,
PG8E (Diablo Canyon)
D.
A. Taggert,
PGEE (Diablo Canyon)
.
News Services,
PG8E
'T.
L. Grebel,
PG&E (Diablo. Canyon)
State of California
Sandra Silver (Report Only)
MAY? <
1ggg
bcc w/enclosure:
docket file
Project Inspector
Resident
Inspector
G.
Cook
A. Chaffee
R.
Zimmerman
B. Faulkenberry
J. Martin
bcc w/o enclosure
2:
M. Smith
J. Zollicoffer
N. Mestern
REGION V/dot
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PNarbut
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