ML19317F931
| ML19317F931 | |
| Person / Time | |
|---|---|
| Site: | Rancho Seco |
| Issue date: | 04/27/1976 |
| From: | Mattimoe J SACRAMENTO MUNICIPAL UTILITY DISTRICT |
| To: | Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| Shared Package | |
| ML19317F932 | List: |
| References | |
| NUDOCS 8002210646 | |
| Download: ML19317F931 (2) | |
Text
.
.. :n l%.
m
~~
m l
Q
., a
. =.)
(/
SACRAMENTO MUNICIPAL. UTILITY DISTRICT C} 6201 S Street, Box 15830, Sacrameato, Califomia 9581f; (916) 452 3211 April 27, 1976 9
A Mr. R. H. Engelken Director of Regulatory Operations G
NRC Operations Office, Region V f.[.7 2
0,,gY (,
1990 N. California Boulevard 7
Ei 8
Walnut Creek Plaza, Suite 202 p
/
]'
Walnut Creek, Ca.
94596
,4 h
Re: Operating License DPR-54 j
s Docket No. 50-312 G,
y)
Reportable Occurrence 76-7
-Q;4
Dear Mr. Engelken:
As defined by Technical Specifications for Rancho Seco Nuclear Generating Station, Section 6.9.1, and Regulatory Guide 1.16, Revisi~on.4, /
Section C.2.b.3, the Sacramento Municipal Utility District is hereby reporting the following Reportable Occurrence as RO 76-7.
Technical Specifications Section 3.11.'
' quires that the Reactor Building Polar Crane and Auxiliary Hoist be operated over the fuel transfer
.)
!g canal only when necessary and in accordance with approved procedures when-t
\\s) ever the reactor vessel head is removed and fuel is not being moved.
In -
most instances, these lifts are described in specific maintenance procedures to comply with chis Technical Specification. On April 12, 1976, it was
~
reported thac, contrary to Specification 3.11.3, several lifts were made over the fuel transfer canal without the use of any approved procedure.
The plant was shut down and the RCS was in the refueling mode with the vessel head removed. No material movements were made over the open reactoi-vessel.
he bases for Specification 3.11.3 state that this restriction is to preclude the dropping of materials or equipment into the reactor vessel, possibly da.naging fuel a 2semblies. As a safety margin, the limit boundaries are extended to the fuel transfer canal. The use of these hoists to make lifts of materials, personnel or equipment which could not cause fuel damage if dropped over the fuel transfe canal is not restricted by this Specifi-cation.
One of the lif ts over the fuel.ransfer canal reported on April 12 involved a four-ten transfer cask for reactor vessel surveillance specimens.
Other lif ts involved equipment or material too small and light to damage reactor fuel. However, the lift of the cask was in violation of Specifica-tion 3.11.3, and this constitutes a Reportable Occurrence.
It
(
)
G 0 0 2 210 8
f"
~
@ 5..'
A 's ilCCTRIC $fsTF" ; [ % V t N C.
'100E THAt ri c o. o c o in fyr wF:nI t<
ca,i.
O
~
a l
I
.Mr. R. H. Engelken April 27, 1976 As a response to this occurrence, a procedure has been written for operating the Folar Crane and Auxiliary Hoist under all conditions for lif ts.over the transfer canal which are not specified under other approved d
procedures, but not over the core..Maintenanco Procedure M.31, " Operation
- ?
of the Reactor Building Polar Crane and the Fuel Transfer Canal Auxiliary
.j
- Hoist", provides limits a'nd precautions for movement over and into the fuel transfer canal, equipment requirements and restrictions and procedural metho'ds to be used for lifts.
-1 Movement of materials over the core that are not part of the refuel,
'l ing operation will require additional procedures to cover the unique situation.
The items covered by Procedure M.31 are practices already in effect at Rancho Seco. However, this formalized procedure will prevent a future occurrence-of this type and provide a written reference for crane op' ration
[,
e
~
There wa.: no transient associated'with this' occurrence.
Respectfully,
.J
- t.. &('x s
g, J.
J. Mattimoe Assistant Ceneral Manager and Chief Engineer a?
JJM:RWC: sal
~
Attach.
7
^
es; MIPC (3)
IE (30)-
\\ss M >
,\\
-