ML20155C998
| ML20155C998 | |
| Person / Time | |
|---|---|
| Site: | 07109001 |
| Issue date: | 08/30/1988 |
| From: | Wheadon W PACIFIC NUCLEAR SYSTEMS, INC. |
| To: | Macdonald C NRC OFFICE OF NUCLEAR MATERIAL SAFETY & SAFEGUARDS (NMSS) |
| References | |
| NUDOCS 8810110005 | |
| Download: ML20155C998 (14) | |
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NU[ LEAR August 30, 1988 Docket No. 71-9001 IAIORITY ROUffr:g Mf"E U.
S. Nuclear Regulatory Commission
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office of Nuclear Materials Safety and Safeguards ff2M.
Division of Safeguards and Transportation 4/ t g
(
tT Washington, D.
C.
20555 f
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Attention:
C.
E. MacDonald, Chief gagy Transportation Branch i
SUBJECT:
IF-300 CASK-DISCOVERY OF NONCONFORMING PRECON VALVE HARDWARE ON IF-304 Gentlemen During the scheduled annual inspection of the IF-304 Fuel Shipping Cask.
performed at GE's Morris Operation on August 11, 1988, nonconforming hairdware was found installed in the cavity fill and drain line systems adjacent to the upper and lower Precon valves.
The pur ose of this letter is to inform your office of the conditio y to present information relative to the subsequent investigation \\and to advise you of the steps taken to prevent recurrence.
f We at Pacific Nuclear have carefully reviewed the available data 1
and conclude that the inadvertent use of the nonconforming hardware did not result in a substantial safety hazard.
The rationale for this decision is contained in the attachments to this letter.
If you have any questions regarding the above matter, please contact Wallace C. Wheadon at (206) 874-2235.
Written communication should be directed to the undersigned.
Respectfully submitted,
$%g 0 5R Wallace C.
Wheadon, Director 20 Spent Fuel Servicqs Division
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A. Bert Davis, Region III, NRC g\\
me T. E. Tehan, PNSI
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Q E. Brooks, PNSI l
C. Temus, PNSI 2>EP2 Oi i
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Docket No. 71-9001 MEMO TO FILE Attachment to letter to NRC dated 8-30-88 August 23, 1988 NONCONFORMING PRECON VALVE HARDWARE ON IF-304 During the scheduled annual inspection of the IF-304 Fuel Shipping Cask, performed at GE's Morris Operation on August 11, 1988, nonconforming hardware was found installed in the cavity fill and drain line systems adjacent to the upper and lower 1
Precon valves.
(See Attachments 1 through 6).
Drawings VPF 3869-M9, Rev 21 and VPF 3869-M43, Rev 19 require the use of schedule 80 c1.ose nipples and a 3000 psig rated elbow.
Contrary to this requirement, schedule 40 nipples and a
150 psi rated elbow were found to have been installed.
Note: The IF-300 Consolidated Safety Analysis Report (CSAR), NEDO-10084-3 and the Certificate of Compliance (9001 Rev 22) do not specifically identify the type of hardware to be used in these specific locations.
Table IX-1 of the CSAR identifies the Cavity Drain Line Assembly as being "safety related".
This implies that the NRC be notified in accordance with the requirements of 10CFR21 and 10CFR71.95 when a substantial safety hazard is discovered.
10CFR21 defines a substantial safety hazard as "a loss of safety function to the extent that there is a major reduction in the degree of protection provided to the public health and safety for any facility or activity licensed...".
After a careful review of the information presented to me it is my considered l
opinion that a "substantial safety hazard" did not exist and that
{
reporting of the incident to the NRC in accordance with the above identified documents is not required.
JUSTIFICATION An analysis was performed to determine if the nonconforming hardware referenced in Attachment 2 would fail or cause a major reduction in the degree of protection provided to the general public (Attachment 7).
The results of the calculations indicate l
that the nonconforming hardware will not fail at the maximum l
pressures which could be encountered within the cask during a l
hypothetical worst case accident condition.
During normal operation of the cask the internal pressure is 29 psig (Reference CSAR p. ige 6-26).
The maximum anticipated internal cask pressure under the worst caso accident condition is 266.5 psig (Reference CSAR page 6-50).
The calculations indicate that maximum working pressure of the schedule 40 nipple is 910 psig, while the ultimate pressure of the 90 degree elbow is 400 psig.
It should also be noted that the relief pressure of the cask burst disk is 350-400 psig.
An additional consideration is the fact that two independent unlikely conditions must exist for the nonconforming hardware to experience the accident condition pressures.
The
NONCONFORHING PRECON VALVE HARDWARE ON IF-304 Page 2
)
first is that all the fuel rods in all of the fuel bundles within the cask must rupture releasing all the residual gas to the interior of the cask.
The second independent condition is that the Precon valves, which are lock-wired in a closed position must suddenly open or develop massive leaks.
These valver are located between the cask cavity and the nonconforming hardware.
)
The use of schedule 80 nipples and 3000 psig elbows became a requirement in July of 1985.
For apprcximately 13 years prior to that time schedule 40 nipples and 150 psig elbows were used in the locations under discussion (See Attachment 8).
During that time the IF-304 cask, as well as the other three IF-300 casks I
were t.ydrostatically tested to 600 psig at room temperature at time of manufacture.
In addition cask IF-302 was hydrostatically tested to 600 psig three additional times.
In each case the casks were equipped with schedule 40 nipples and 150 pound rated elbows.
No evidence of failura was ever noted.
Each of the IF-300 casks are subject to an annual inspection which tests the cask cavity, including the nipplee and elbow at 400 psig.
In addition prior to each time the cask is shipped an inspection is made at 200 psig.
CORRECTIVE ACTION An inspection was made of the IF-362 cask and it was determined that the correct components were properly installed.
Cask IF-301 will be inspected before it is placed into service at San Onofre.
It is currently required that the cavity fill and drain lines be inspected for use of conforming hardware during the annual inspections.
It was during such an inspection that the nonconforming hardware was discovered.
It is also a requirement that any time hardware is removed from the cask it must be replaced with parts which have been properly inspected and certified as meeting the drawing requirements.
It is apparent that this replacement requirement was not followed on the IF-304 cask.
To prevent recurrence of this problem all persons who normally perform maintenance and/or inspections en the casks have been notified of the existence of nonconforming hardware and of the requirement for using only parts which have been inspected and certified.
All spare part locations have been inspected and l
it was verified that nonconforming parts were not included in the parts inventory.
l
NONCONFORMING PRECON VALVE HARDWARE ON IF-304 Page 3 It is therefore concluded that the inadvertent use of the noncomplying hardware did not result in a
substantial safety hazard since the containment of the cask would not be breached even during the most severe accident scenario, i.
- e. rupture of all of the fuel rods in all of the fuel bundles.
Necessary steps were taken to prevent recurrence of the problem.
Notification of the incident to the NRC as pet 10CFR21 or 10 l
CFR71.75 is not required.
/
W0 MW Wallace C. Wheadon Director Spent Fuel Services Division Pacific Nuclear Systems, Inc.
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\\ YYY GE Nuclear Energy
~' '...
- c..n August 17, 1988 Mr. T. E. Tehan Pacific Nuclear Systems, Inc.
7555 East Collins Road Morris, IL 60450
SUBJECT:
NONCONFORMING PRECON VALVE HARDWARE ON IF-30a l
On August 11, 1988, during the annual inspection of IF-304, nonconforming hardware was found installed on the upper and the lower Precon valves.
One requirement of an IF-300 annual inspection is to assure that both casks I
cavity Precon valves are tested for helium leak tightness. The most efficient j
manner of complying with this requirement is to replace the existing valves i
with bench tested valves. When the hardware was removed in preparation for I
replacing the valves and subsequent helium leak testing, it was determined I
that a nonconforming elbow and two nonconforming close nipples were installed.
Drawing VPF 3869-M9 (Rev. 21) indicates that a 3000 psi rated elbow and a schedule 80 nipple shall be used. Our inspection reports (MOIR 88-099, MOIR 88-104 and MOIR 88-105) indicate that a comercial 150 psi elbow and a schedule 40 nipple were installed on the lower Precen valve and a schedule 40 nipple was installed on the upper Precon valve.
The origin of the offending hardware is unknown.
In addition, it is unknown if IF-304 was received from NPPD with the nonconforming hardware.
A subsequent inspection of the Precon valve hardware on IF-302 revealed that the proper hardware was (is) installed.
As you are aware, the elbow and nipple are "Safety Related" (our 1A classification) and 10CFR21 applies.
Therefore, we are officially notifying you (the cask owner) by this letter for any possible action due to 10CFR21 and 10CFR71.95 requirements.
If we can be of any assistance in this matter, please don't hesitate to call.
Sincerely, bb MN L. L. Denio Manager, Plant Services LLD: tit Attachments cc:
T. E. Ingels - w/o att.
1.
NIR 88-007 J. D. Kesman - w/o att.
2.
MOIR 88-099 S. P. Schmid - w/o att.
3.
MOIR 88-104 4
MOIR 88-105 5.
MOIR 88-108
TW&GW pSPENT FUEL SERVICES OPE NIR NONCONFORMING ITEM RECORD SHEET _
OF 9 $t l l
8 N/A MCT DATF INSPECTORnNITI ATOR oWG No.
REV PART No, P ROJE CT.PROGR AM Po.ORJQtNo, pqg IF-304 7014-50106-3 VPF 3869-M9 21 M9
.3 L M9-14
$UPPLIERIF ABRIC ATCR TYPE OF INSPECTION l ITEM NAME Precon Valve Assembl y N/A Rn C itP O SOURCE O oTHER d
- NONCONF ORM ANC LiDi$CRE P ANCY - LIST ACCEPT ANCE ST AND ARD AND V ARI ATION During the annual inspection of IF-304, a nonconforrning one inch 90 degree elbow and a nonconforming one inch close nipple were found installed o
the lower Precon valve (V-7).
Drawing VPF 3869-M9 (Rev 21) indicates tha-the elbow must have a rating of 3000 psi and that the close nipple must bg a
schedule 80 wall thickness. Contrary to this requirement, the installeo elbow was standard commercial grade (150 pst) and the installed nipple wa a
schedu6e 40 Wall thickness. Further inspec tion revealed that the clos nipple on the upper orpCon valve was also nonconforming.
SHEET ATT ACHED O i Ol$PO5:T ION iN ST R VC '. lON One requirement of the annual inspection of a IF-300 cask is to replacr the installed Precon valves with bench tested Precon valves.
When Precod valve V-7 was replaced, the offending hardware was removed and replacet
..ith certified hardware from stock. As a precaution, an inspection o*
IF-302 Precon valve hardware shall be performed to assure that the p r ob ler is not generic to all IF-300 casks.
SHEET ATTACHED [
CtSPC?if TON R AT60N ALE The origin of the nonconforming elbow and nipple is unknown and it is no the intention of this NIR to speculate on the applicability of safet implications of 10 CFR 71.95. The purpose of this NIR ts to document tha the appropriate Precon valve hardware has been installed.
CAR SHEET ATT ACHED [
OtSPOstTION LEVEL 1 LEVE L 2 (MRBI Di$ Post T 40N l'$
O DISPOstTION SIGN ATURE IENGl DATE SIGNATVRE DATE E F ( R T O L E pt 2 0
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INSPECTION RICORD 8-//- U Date:
Item (s) Inspected:
Inspector:
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ATTACHMENT 4-MORRIS OPERATION INSPECTION REPORT IF-300 ANNUAL INSPECTION DATE CASK MOIR S' /#
8'M " 88 30 REF.
A R
PARA.
INSPECTION C
E COMMENTS C
J V-10 2.12.3.2 Hettum Leak Testi Precon Vent Valve Sertal Number See Also Vent Valve X
Procon Drain Valve Serial Number V"U glr S10 Drain Valve X
Rupture Disk X
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Mo 4 MO!R f*M*80 CASK DATE REF.
A R PARA.
INSPECTION C
E COMMENTS C
J V-/O 2.12.3.2 Heltum Leak Test Precon Vent Valve Sertal Number Y 'I See Also Vent Valve X
Precon Drain Valve Serial Number G!R 510 Drain Valve
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p ;oz & aN vave.s Putpose1
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August 18, 1988 T. E. Tehan
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ADDITIONAL INFORMATION FOR MRS ON GE N!R-88-007 Another justification of no safety significant for NIR-88-007 is as follows:
1.
All casks were nydrostatically tested to 600 psig at room temperature at time of mar.ufacture.
2.
IF-302 has had three additional 600 psig test runs.
3.
The cask at that time was equipped with sch. 40 nipples and 150 lb rated elbows.
4 One set of this hardware (the one valve used to pressuri:e the cask normally the drain valve) saw 600 psig before valve was closed.
5.
No evidenca. of yielding or failure of this hardware was ever noted.
In fact hardware was used in normal operation.
6.
For 13 ye6rs the annual tests were ran at 400 psig and all preshionent tests were ran at 200 psig using this type of pipe fitting.
Therefore, my 600 psig ultimate pressure for the 90' elbow used in my stress calculation is very conservative.
TET/cp Cc:
W. C. Wheadon R. K. Wright L. L. Dento TET 88-38 i
1 I
Pacific Nuclear Systems,Inc, ';* Sr 330m S: ee' C+:ra.'.a. A aw?:* HX3 :2N)6'42235
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