ML20207T770
| ML20207T770 | |
| Person / Time | |
|---|---|
| Site: | Sequoyah  |
| Issue date: | 02/26/1987 |
| From: | Zech G NRC OFFICE OF SPECIAL PROJECTS |
| To: | White S TENNESSEE VALLEY AUTHORITY |
| References | |
| NUDOCS 8703240322 | |
| Download: ML20207T770 (3) | |
See also: IR 05000327/1986042
Text
[
' '
.
..
~
<
q
FEB 2 61987
Tennessee Valley Authority
EATTN: Mr. S. A. White
Manager of Nuclear Power
6N 38A Lookout Place
1101 Market Street
Chattanooga, TN 37402-2801
Gentlemen:
SUBJECT:
REPORT NOS. 50-327/86-42 AND 50-328/86-42
We have completed our evaluation of your October 24, 1986, response to our
Notice of Violation issued on September 26, 1986, concerning activities at your
Sequoyah facility.
After careful review of the basis for your denial of Violation 50-327,328/
86-42-01 (Example 2), we have concluded, for the reasons presented in the
enclosure to this letter, the violation occurred as stated in the Notice of
Violation.
Therefore, pursuant to 10 CFR 2.201, please submit to this office
within 30 days of the date of this letter, a written statement describing the
reasons for the violation, the corrective steps which have been taken and the
results achieved, corrective steps which will be taken to avoid further
violations, and the date when full compliance will be achieved.
In accordance with Section 2.790 of the NRC's " Rules of Practice," Part 2,
Title 10, Code of Federal Regulations, a copy of this letter and its enclosure
will be placed in the NRC's Public Document Room.
The response directed by this letter is not subject to the clearance procedure
for the Office of Management and Budget issued under the Paperwork Reduction Act
of 1980, PL 96-511.
Sincerely,
ORIGINAL SIGNED BY
GARY G. ZECH
Gary G. Zech, Assistant Director
TVA Projects Division
Office of Special Projects
cc w/ encl:
y
S. L. Abercrombie, Site Director
Sequoyah Nuclear Plant
cR'. W. Cantrell, Acting Director
Nuclear Engineering
I L. Gridley, Director
Nuclear Safety and Licensing
vd R. Harding, Site Licensing
Manager
8703240322 870226
ADOCK 05000327
O
ll1
M cj
_ -- ----_---- -
,
d
e
E5L .Io 357
ENCLOSURE
Your denial of Violation 50-327,328/86-42-01 (Example 2), is based on the grounds
that the work instructions used for installation of the solenoid valves were
adequate; however, this is questionable in light of the fact that the vendor
bulletin (not pr.rt of the installation package) for the ASCO model 8316 valves
for nuclear power plants, documents that the four valve bonnet (end plate) screws
have torque values of 95 plus or minus 10 inch pounds in a crisscross manner.
Since the vendor was specific with regard to torquing values and the tightening
pattern for the bonnet screws, these items are considered significant and should
be followed.
In addition, it is understood from informal discussions with
Sequoyah that they have actually gone back arid tightened the bolts to the vendor
values.
You further state that the environmental qualification of the valve was not
affected by the reconfiguration of the mounting support as performed under work
package 11806, since the area of the valve that would have been affected by the
improper installation of the bolts is internally isolated from the portion of
the solenoid valve which contains that electric coil.
Since the valve is
environmentally qualified as a whole device, this argument is considered not
applicable to the situation.
In fact, in a letter to Dr. J. Nelson Grace, RII
Administrator, from
R. L. Gridley, Director, Nuclear safety and Licensing,
Subject: Watts Bac Nuclear Plant Units 1 and 2 - Improperly Installed Solenoid
Valves - WBRD-50-390/85-52, WBRD-50-391/85-14 - Final Report, dated May 2, 1986,
TVA states that ASCO solenoid valves are supplied to them as a complete qualified
package with supplier-imposed instructions which must be followed to ensure that
their application in the plant conforms with qualification tests.
The position
taken in this letter seems to be contrary to the TVA Sequoyah position taken in
the denial of the violation.
The NRC concurs with the original TVA position
dated May 2,1986, and disagrees with the Sequoyah position that the environ-
mental qualification of the valves was not degraded. We, therefore, believe the
violation occurred as stated.
T !.
.;r
.
Tennessee Valley Authority
2
'bcc w/ enc 1:
pk Keppler,. OSP
Ebneter, OSP
. Zwolinski, OSP
Liaw, OSP
-
R. Connelly, OIA
'
.:P. Barr, RII
INRC Resident Inspector
NRC Document Control Desk
State of Tennessee
i'
l
i
i-
!
d
2/N/87
2ht/87
A2G/87