ML16341G067
| ML16341G067 | |
| Person / Time | |
|---|---|
| Site: | Diablo Canyon  |
| Issue date: | 04/19/1991 |
| From: | Martin J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| To: | Shiffer J PACIFIC GAS & ELECTRIC CO. |
| Shared Package | |
| ML16341G068 | List: |
| References | |
| NUDOCS 9105060060 | |
| Download: ML16341G067 (6) | |
See also: IR 05000275/1991009
Text
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UNITED STATES
NUCLEAR REGULATORY COIVIIVIISSION
REGION V
1450 MARIA LANE,SUIT E 210
WALNUTCREEK, CALIFORNIA94596
APR i 9
)gBI
Docket No. 50-275
Pacific
Gas
and Electric Company
77 Beale Street,
Room 1451
San Francisco,
94106
Attention:
Mr. J.
D. Shiffer, Senior Vice President
Nuclear
Power Generation
Business
Unit
Gentlemen:
SUBJECT:
NRC AUGMENTED INSPECTION OF DIABLO CANYON UNIT 1
This refers to the Augmented Inspection
Team (AIT) inspection
conducted
by
Messrs.
P. Morrill, B. Olson,
D. Fischer,
W. Lyon, S.
Mazumdar
and
K. Johnston
during the period of March 8,
1991 through March 13,
1991.
This inspection
examined the loss of off-site power event which occurred
on March 7, 1991,
and
other activities authorized
by NRC License
No. DPR-80.
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,
interviews with
personnel,
and.observations
by the inspectors.
Our inspection
concluded that it was providential that no one was killed by
the 500
KV short to ground.
Fortuitously, the air arc causing
the loss of
off-site power occurred
when
no one
was in the electrical
ground path for the
crane. or its load.
In addition, the uncontrolled
use of similar cranes
around'he
500
KV lines appears
to have occurred in the past,
thereby
violating
PG&E Accident Prevention
Rules
and ignoring grave personal
danger.
This situation demonstrates
a disregard for industrial safety.
Despite your staff's review of the lessons
learned
from the Vogtle loss of
power event,
the key issue of controlling vehicle traffic around off-site
power supplies
was not addressed.
The
PG&E strategy left the plant off-site
AC power supplies
vulnerable to avoidable challenges.
Choosing not to deal
with the Vogtle event initiator demonstrates
that your event review process
needs
to be strengthened.
It is particularly discouraging to me to note that just one month earlier the
NRC Deputy Executive Director for Operations
and myself questioned
your
senior site management
regarding Vogtle lessons
learned
and vehicle access
controls
around plaIIt off-site power supplies.
We were assured
that the
Vogtle event
had been reviewed
and that there
was
no problem at Diablo Canyon.
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Conversely,
the team considered
your policy to avoid mid-loop operation
when
possible. during outages
to have
had
a positive safety effect and to have
actually simplified the outage activities.
The inspectors
observed that your
schedule
has
been constructed
so that mid-loop'perations
would only be used
if needed at the
end of an outage
when decay heat is low.
Loss of off-site
power or loss of
RHR is much less significant with this strategy.
The issues
raised
by the. AIT in the enclosed
report will be discussed
in
future Management
Meetings.
Any appropriate
enforcement
actions will be
contained in subsequent
inspection reports.
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.
Should you have
any questions
concerning this inspection,
we will be pleased
to discuss
them with you.
Since
ly,
J.
B. Martin
Re'gional Administrator
Enclosure:
Inspection
Report
No. 50-275/91-09
cc w/enclosure:
J.
A. Sexton,
J.
D. Townsend,
Vice President/Plant
Manager,
PG8E
F.
F.
Locke, Esq.,
PG8E
Co.
D.
A. Taggart, Director, equality Support,
PGEE
B. Thomas,
News Services,
PGEE
T.
L. Grebel,
Regulatory Compliance Supervisor,
PGEE
State of California
Sandra Silver (Report Only)
APR i 9 isa)
bcc w/encl osure:
D. Trimble,
OCM/JC
Ms. J.
Zamek,
1123 Flora Road,
Arroyo Grande,
CA
93420
W.
Lyon,
NRR/SRXB
D. Fisher
NRR/OEAB
S.
Mazumdar
AEOD/ROAB
Docket File
Resident Inspector
Project Inspector
G.
Cook
B. Faulkenberry
J. Martin
bcc w/o enclosure:
M. Smith
J. Zollicoffer
REGION 9
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