ML20206U839
| ML20206U839 | |
| Person / Time | |
|---|---|
| Site: | Sequoyah  |
| Issue date: | 09/24/1986 |
| From: | Hutzler C, Owen D TENNESSEE VALLEY AUTHORITY |
| To: | |
| Shared Package | |
| ML20206U835 | List: |
| References | |
| MC-40302-SQN, MC-40302-SQN-R01, MC-40302-SQN-R1, NUDOCS 8610080428 | |
| Download: ML20206U839 (3) | |
Text
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TVA EMPLOYEE CONCERNS REPORT NUMBER: MC-40302-SQN SPECIAL PROGRAM REPORT TYPR: Sequoyah Nuclear Plant Element REVISION NUMBER:
1 l
TITLE: Valve (Cracked) as Related to Material PAGE 1 0F 3 Control REASON FOR REVISION:
Revised to incorporate TAS and SRP comments.
PREPARATION PREPARED BY:
W 9l%4ffh SIGNATURE
' DATE REVIEWS PEER:
9 / 2 4 /8(,
st SIGIATURE DAT8 a
TAS:
i SIGNATURE DATE CONCURRENCES hDR DO 500 327 CEG M
8[p p
POR
/
/
i SRP:
SIGNATURE DATE SIGNATURE DATE APPROVED BY:
ECSP NANAGER DATE MANAGER OF NUCLEAR POWER DATE CONCURRENCE (FINAL REPORT ONLY) 1392T
i TVA EMPLOYEE CONCERNS REPORT NUMBER: MC-40302-SQN SPECIAL PROGRAM REVISION NUMBER: 1 PAGE 2 OF 3 f
I.
INTRODUCTION This report addresses the perceived problem stated in employee concern PH-85-035-002.
It should be noted that this concern was site-specific to Watts Bar Nuclear Plant (WBN) and was made generic to Sequoyah Nuclear (R1 Plant (SQN) during evaluation at WBN. This was based on the fact that one of the valves in question at WBN is now installed in unit 2 at SQN.
II.
SUMMARY
OF PERCEIVED PROBLEMS The perceived problem that this report addresses is that one of the 3-inch valves in the top of the unit 2 pressurizer at SQN was previously installed in the same area in unit 1 at WBN and one of these valves is alleged to have a crack or lamination in the valve body that l
runs into the weld area. The subject valve was identified during the j
evaluation at WBN to be serial number 1983-3, manufactured by Target Rock Corporation.
L III. EVALUATION METHODOLOGY
?
1.
Reviewed expurgated file for additional information related to this perceived problem.
2.
Reviewed element report MC-40302 and the subject case file to determine what additional action was required in order to 4
adequately address this concern for SQN.
3.
Witnessed the visual inspection of the interior and exterior of the I
subject valve body for indications of cracks or laminations by a Level II NDE inspector.
IV.
SUMMARY
OF FINDINGS 1.
No pertinent information was found by reviewing the expurgated file for the subject concern.
t 2.
Based on a review of element report MC-40302 and the subject case file, it was concluded that Target Rock Valve serial number 1983-3 i
was the only valve at SQN that required examination for cracks or laminations.
1 i
.u_
O TVA EMPLOYEE CONCERNS REPORT NUMBER: MC-40302-SQN SPECIAL PROGRAM REVISION NUMBER: 1 PAGE 3 0F 3 3.
Spare valve serial number 1985-10 was visually examined for cracks or laminations and none were found. This valve was then placed in service replacing the subject valve (serial number 1983-3). The subject valve received a visual inspection of the interior and I
exterior of the valve body by a Level II NDE inspector. No lR1 indications of cracks or laminations were found in the weld areas.
l However, there was an eliptical shaped indication on the interior surface of the outlet side of the valve body adjacent to the indicator tube. This was further evaluated by a Level III NDE 4
inspector and determined not to be a crack, but the specific nature of the indication and the valve's suitability for service was not determined by this inspection (note:
this valve is no longer installed). The indication identified was also present in the valves I that were examined at WBN. The indications in the valves at WBN were l evaluated and determined to be inherent to the manufacturing process lR1 and not detrimental to the safe operation of the valves. Work
[
j Requests (WR) B-115224 and 115223 authorized this work and documented [
the inspections performed.
Conclusion i
Based on the above and the information learned during the inspection of the other three Target Rock valves that were examined at WBN, the indication found in the subject valve is not in the weld area as stated in the perceived problem, and this indication is inherent of the manufacturing process for these valves and not a crack or lamination.
Therefore, the concern is not valid. However, there are no criteria to IR1 allow evaluation of the indication in these valves, and this needs to be addressed by line management.
V.
ROOT CAUSE None VI.
CORRECTIVE ACTION To be supplied by line management VII. GENERIC APPLICABILITY Based on the fact that the perceived problem this report addresses is with a specific valve and the perceived problem was not validated, there is no reason to believe this problem could exist at BFN or BLN.
a VIII. ATTACHMENTS None
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