ML20032A521
| ML20032A521 | |
| Person / Time | |
|---|---|
| Site: | Diablo Canyon  |
| Issue date: | 10/19/1981 |
| From: | Crane P, Crone P PACIFIC GAS & ELECTRIC CO. |
| To: | Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| References | |
| 10CFR-050.55E, 10CFR-50.55E, NUDOCS 8110300290 | |
| Download: ML20032A521 (2) | |
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Dock'et Nos. 50-277/323 f -..
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October ~ 19, 1981 cs g-c2 Mr. R. H. Engelken, Director
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U. S. Nuclear Regulatory Commission
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9 vp en M N, Re: Docket 50-275 Docket 50-323 Diablo Canyon Units 1 and 2
Dear Mr. Engelken:
On September 18, 1981, Mr. John Burdoin was notified by tele-phone of a deficiency reportable under 10 CFR 50.55(e). The report addressed recently discovered deficiencies in the design of the contain-ment spray system pipe supports located within containment.
The following deficiencies were identified:
1.
An incorrect thermal analysis was used for hanger Mads.
2.
This analysis was performed with one snubber modeled as a rigid member.
3.
The variable spring settings for the pipe sy, ports were improperly set based on a deadload analysis which assumed, incorrectly, that the pipes contained water.
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4.
In designing a pipe anchor, the loads from only one side were used.
/ 6 8110300290 811019' PDR ADOCK 05000275 S
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i Mr.-R.-:H.-Engelken October,19, 1981-New analyses were performed. addressing all of the above items.
. All supports were reviewed,-qualified, or~ redesigned:as' dictated by.the corrected support loads. As;a result, two anchors require structursi-modification and the spring supports'for those two anchors require minor l changes. These changes will be' completed prior to power: ascension.
We reported these deficiencies on.the assumption 1that an impact' on' safety existed. -Since the design has been modified, we deemed it unnecessary to make the extensive reanalysis required to_ determine if tie systems-would have remained operational had these deficiencies-remainedLundetected.
This is'the final report on the subject.
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Very.truly yours,
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I cc: Director 1
Office of-Inspection and Enforcement
(
U. S. Nuclear Regulatory Commission Washington, D. C. 20555 Service List i
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