ML19309G729
| ML19309G729 | |
| Person / Time | |
|---|---|
| Site: | Prairie Island  |
| Issue date: | 04/30/1980 |
| From: | Tierney F NORTHERN STATES POWER CO. |
| To: | |
| References | |
| NUDOCS 8005070459 | |
| Download: ML19309G729 (1) | |
Text
8 0 0 5 0 7 0VS9 S
NSD NORTHERN STATES POWER COMPANY PRAIRIE ISLAND NUCLEAR GENERATING PLANT RR #2 Welch, SIN 55089
)
April 30, 1980 Mr. James G Keppler, Director Region III Of fice of Inspection and Enforcement U. S. Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, IL 60137 ATTN: D C Boyd Reportable Occurrence No. 80-15 On April 29, 1980, a volumetric test of the Unit 1 containment maintenance airlock showed leakage of about 600 sec/ min.
The Tech Spec limit is 409 scem.
The seals for the inner door were replaced and leakage was acceptable.
The volumetric test pressurizes the space between the doors to 46 psig. Thus, the tes t pressure tends to open the inner airlock door. Also, door s tops are installed prior to the test to prevent overcompression of (and damage to) the door seals. For these reasons it is concluded that is is quite possible that door leakage would have been acceptable during the postulated accident. However, this was not proved.
The outer door was operable throughout the period.
Sincerely, Q
h
- c. P. Tier e Jr.,
Plant Manager Prairie "aland Nuclear Plant FPT:div cc: L 0 Mayer Director, MIPC (2)
% Distribution Services Branch, DDC, ADM V
C D Feierabend g 0 1