ML20082P910
| ML20082P910 | |
| Person / Time | |
|---|---|
| Site: | Fort Saint Vrain  |
| Issue date: | 09/06/1991 |
| From: | Crawford A PUBLIC SERVICE CO. OF COLORADO |
| To: | Weiss S NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM), Office of Nuclear Reactor Regulation |
| References | |
| P-91282, NUDOCS 9109110144 | |
| Download: ML20082P910 (6) | |
Text
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P.O. Box B40 September 6, 1991 Denver co 80201- 0840 Fort St. Vrain Unit No. 1 A. Clegg Crawford P-91282 vic. Pr..d.nt Nuclear operations U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D.C.
20555 ATTN: Dr. Seymour H. Weiss, Director Non-Power Reactor, Decommissioning and Environmental Project Directorate Docket No. 50-267
SUBJECT:
Natural Gas Collection Pipelines in the Vicinity of Fort St. Vrain - Perinanent Solution to Connection With 16 Inch Pipeline
REFERENCE:
PSC Letter, Crawford to Weiss, dated June 19, 1991 (P-91211)
Dear Dr Weiss:
d In the Referenced letter, Public Servic-Company of Colorado (PSC)
I submitted the proposed configuration of a redundant check valve station which would prevent backflow of natural gas from the 16 inch diameter pipeline into a postulated pipeline rupture in the Fort St.
Vrain (FSV) natural gas collection system. of the Referenced letter is the " Test Procedure to Confirm Check Valve Operation".
In a Mr. Erickson (NRC) phone conversation dated September 4, 1991, between
, Ms. Campbell (NRC), Mr. Johns (PSC), Mr. Becker (Western Gas Supply Co. - a PSC subsidiary) and Mr. Carvalho (Western Gas Supply Co.), the NRC pointed out an error in Step IV.1 of the
" Test Procedure to Confirm Check Valve Operation".
l-The Attachment to this letter is a corrected version of this test procedure.
In addition to correcting the error identified in Step l
IV.1, the test procedure has also been amended to clearly identify removal and re-insertion of threaded steel plugs, which will be installed at the outlet of vent valves and test gauge isolation valves to prevent entry of moisture or dirt into the valves during l
normal operation.
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9109130144.910906 1
PDR ADOCK 05000267 p
P-91282
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Page_2-l September:6, 1991 Should: you - have = any : questions. concerning - this submittal, please contact Mr
'M. H. Holmes at (303) 480-6960.-
' Very truly yours',.
$ Yeff hf A. Clegg Crawford; Vice President
" Nuclear Operations ACC/JRJ:km Attachments cc: Regional Administrator, Region IV j-
[_
Mr. J. B. Baird
- Senior Resident inspector Fort St. Vrain -
Mr. Robert M. Quillin, Director
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Radiation Control Div.ision Colorado Department o'f Health 4210 East.11th Avenue Denver,.CO-80220 Mr. Steve Ruffin Project Manager l-:
- Irradiated. Fuel Section L
Fuel-Cycle Safety Branch Office of Nuclear Material Safety and Safeguards-lj
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P-91282 v-
-Page:1' A_ttachment-r" September 6, 1991 Test Procedure to-Confirm Check Valve Operation 1.
With System in normal operation.
(see attached Figure 1):-
valves A, C, and E should be open and valves;F,.G, H I, J, K, and. L should be closed.
Steel plugs are threaded into the outlets of valves F, G, H. K and L during normal operation.
. Valves M and N should be open at all times.
-II.
To test check valve ~CV-1 (see attached' Figure 1):
1..
Remove-threaded steel plugs from the outlets of valves F, G and K.
2.
Install test gauge at G-1 (threaded connection).
3.
Close valves _A and C (see Note 1).
.4.
Open valves F and G to bleed. pressure across CV-1.
5.
Close valve G and slowly open _ valve I.
6.-
-When CV-1 ' closes, there should be no gas flow through
-valve F. ;If the flow through valve F does not stop, go to-Section V.
4 7.
Close valve F and open valve K'.
8.
If there is no pressure build-up_at G-1 within five (5) minutes, close valves K and I~and remove test gauge from.
G-1. -
'III.
To-test check valve CV-2 (see attached Figure 1):
1.
Remove _ threaded steel plugs from the outlets of valves H and L.
2.
Instal 1 test gauge at G-2 (threaded connection).
3.
Open valve H slowly to bleed pressure from upstream side of.CV-2, 4.-
When CV-2 closes, there should be no gas' flow through valve H.
If the flow through-valve H does not-stop, go to Section V.
5.
Close valve H and open valve L.
'P-91282-Page-2 Attachment
'Septembe'r 6, 1991 6.
If there is no pressure build-up at G-2 within five (5) minutes, close valve L and remove test gauge from G-2.
IV.
Return System to normal operation (see attached Figure 1):
1.
Insure valves F,
G.
H, I, J, K and L are all closed.
Replace all threaded steel plugs at the outlets of valves F, G, H, K and L.
2.
Open valves A and C.
3.
Make sure valve E is open.
V.
If a pressure build-up is detected or the flow of gas continues (as indicated in 5teps 11-6 and 11-8 or Steps III-4 l
and III-6), then the following procedure should be followed:
- 1.
Verify all pressure is released from both sides of the check valve in question.
2.
Remove vent plug from cover plate (slowly) and remove cover plate.
3.
Remove removable seat and replace seat seal, clapper seal, and cover seal as per manufacturer's instructions.
4.
Re-test valve as per test procedure.
VI.
Record date, time, and names of people who performed test.
Western Gas Company wil'. forward original test report to Public Ser...
apany of _ Colorado's Manager of Quality Assurance for Nut ear Operations.
Western Gas Supply will maintain a copy of test report in the West Gas Campion office, and forward a copy to Panhandle Eastern Pipe Line Company, c/o Mr.
A.
A.
Smith, Area Superintendent, Transmission.
This test will be performed on a quarterly basis.
[
P-91282-Page 3
' Attachment September 6, 1991 Note 1 When valves A and C are closed, open body bleed fitting on valve.
This tests valve seals to insure there is no bleed through the valve.
If bleed does occur, follow manufacturer's procedure to seal valve.
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