ML20028A004
| ML20028A004 | |
| Person / Time | |
|---|---|
| Issue date: | 10/20/1982 |
| From: | Barnes I, Kelley W NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| To: | |
| Shared Package | |
| ML20027E847 | List: |
| References | |
| REF-QA-99900097 NUDOCS 8211160256 | |
| Download: ML20028A004 (9) | |
Text
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ORGANIZATION: CHICAG0 BRIDGE & IRON COMPANY i
BIRMINGHAM, ALABAMA
?
REPORT INSPECTION INSPECTION NO-99900097/82-01 DATE(S) 7/19-22/82 ON-SITE HOURS:
27 CORRESPONDENCE ADDRESS: Chicago Bridge & Iron Company ATTN: Mr. J. G. Tucker - District Engineering Manager 1500 North 50th Street Birmingham, Alabama 35201 ORGANIZATIONAL CONTACT: Mr. R. Bentley, Engineering Coordinator TELEPHONE NUMBER:
(205) 595-1191, ext. 360 PRINCIPAL PRODUCT: Reactor Containment Buildings, Containment Building Liners and Personnel and Escape Locks NUCLEAR INDUSTRY ACTIVITY: Commercial nuclear production of the Birmingham, Alabama, plant represents 20% of its production.
/0!/7!f4 ASSIGNED INSPECTOR:
W. D. Kelley, Reactive & Coi3xinent Program Date~
Section (R& CPS)
- \\
OTHERINSPECTOR(S):
ds
/o/w[F?-
APPROVED BY:
I. Barnes, Chief, R& CPS Date INSPECTION BASES AND SCOPE:
A.
BASES:
SCOPE:
This inspection was made as a result of the identification by the Sacramento Municipal Utility District of the failure of the reactor building personnel lock interlock furnished to the Rancho Seco Nuclear Generating Station, Unit 1.
PLANT SITE APPLICABILITY:
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S 8211160256 821025 PDR GA999 EMVCHIB 99900097 PDR
ORGANIZATION: CHICAGO BRIDGE & IRON COMPANY BIRMINGHAM, ALABAMA REPORT INSPECTION NO: 99900097/82-01 RESULTS:
PAGE 2 of 4 A.
VIOLATIONS:
Nor.e B.
NONCONFORMANCES:
None C.
UNRESOLVED ITEMS:
None D.
OTHER FINDINGS OR COMMENTS:
1.
Sacramento Municipal Utility District (SMUD) - Rancho Seco Nuclear Generating Station, Unit 1 - Problem reported was failure of the reactor building personnel lock interlock.
a.
Background - The NRC Region V inspector reported on January 30, 1982, that during entry into the reactor building for snubber maintenance inspection, the personnel lock interlock failed by permitting both interior and exterior doors to open simultaneously, thus breaching containment.
b.
Findings (1.) The NRC inspector reviewed the Chicago Bridge & Iron Company (CB&I) instruction manual and drawings for the SMUD, Rancho Seco Nuclear Generating Station reactor building personnel lock. As a result of this review and discussions with applicable CB&I personnel, the following findings were made:
1 1
(a) The CB&I instruction manual for the Rancho Seco Nuclear Generating Station included cautionary statements with l
respect to the necessity for personnel to be familiar with and comply with the operating procedure and maintenance instructions.
l (b)
CB&I manufactured personnel locks have limit switches l
installed, that indicate when the door latches are in the closed position.
Limit switches are not installed, however, which would specifically confirm door closure.
If door rebound occurs because of rapid closure, a failure to secure the door could occur as a result of the door latch closing in front of and not behind the door roller bracket assembly.
The limit switches l
ORGANIZATION: CHICAG0 BRIDGE & IRON COMPANY BIRMINGHAM, ALABAMA REPORT INSPECTION NO.-
40900097/82-01 RESULTS:
PAGE 3 of 4 would still be actuated in this circumstance and would indicate door latches were in the closed position.
(c) Reportedly, SMUD contacted CB&I in 1974 concerning a problem with the personnel lock door gasket, but CB&I was unaware of SMUD having a problem with the interlock.
The NRC inspector was additionally infomed that CB&I was aware the latch could be actuated and not engage the door latch assembly, if the door was closed rapidly and the interlock mechanism was not properly adjusted.
(d) The NRC inspector requested to see the custcmer purchase order and design specification for the Rancho Seco Nuclear Generating Station personnel lock and was informed that the purchase order was located at the CB&I corporate office in Oak Brook, Illinois, and the design specification was filed in the CB&I permanent document file in Houston, Texas.
(2.) Reportedly, several licensees had contacted CB&I regarding problems with their personnel lock, and CB&I had advised the licensees that proper adjustment and maintenance of the mechanisms and gaskets would assure proper and leak-free operation. The NRC inspector requested to see the correspon-dence with licensees concerning reported problems and was informed there was no documentation of these contacts.
(3.) The NRC inspector was infomed that CB&I had duplicated the failure of the personnel lock door latch to secure the door roller bracket assembly in their shop. The testing was stated, however, to have demonstrated that when the personnel lock was fabricated in accordance with approved engineering drawings with the mechanisms properly adjusted, failures did l
not occur.
(4.) CB&I changed the personnel lock door gasket design in 1980 from two rectangular solid elastomer gaskets installed in separate grooves,.to a single " dog tooth" elastomer gasket in a single groove.
Reportedly, a rapidly closed personnel lock door would rebound less with the new gasket design.
CB&I did not notify previous customers of the new " dog tooth" gasket design because it would not fit in the existing gasket grooves in their personnel locks.
(5.) The NRC inspector reviewed the CB&I basic instruction manual for the personnel and escape locks, issued June 1980, to
ORGANIZATION: CHICAGO BRIDGE & IRON COMPANY BIRMINGHAM, ALABAMA REPORT INSPECTION NO.: 99900097/82-01 RESULTS:
PAGE 4 of 4 verify that the rebound of the personnel lock door had been addressed. Paragraph 411.1 of the manual states that rebound of the door is normal and cautions that the amount of rebound depends on how fast the door is closed, and if excessive rebound occurs the door latch may not capture the door roller assembly. The paragraph gave instructions on how the door should be checked for proper adjustment of the door mechanism.
The NRC inspector was informed that the June 1980 basic instruction manual was supplied to CB&I customers receiving personnel locks after the manual issue date.
The scope and adequacy of earlier manual instructions, in regard to door operation and mechanism adjustment, were not specifically reviewed by the NRC inspector during this inspection. The adequacy of CB&I actions after duplica-tion of the failure in their own shop was accordingly not fully evaluated.
A further review of this subject will be performed at a subsequent inspection.
2.
Design Control - Reviewed two sections of the QA manual, the CB&I nuclear contract handbook, a customer's design specification, two design control procedures, one leak rate test procedure, and the l
stress report and design calculations for a containment personnel lock, escape lock and equipment hatch.
Verified procedures had been implemented to control review, approval, release, and issuance of design documents.
l 3.
Nonconformance/ Corrective Action - Reviewed one section of the QA manual, one nonconformance control list, and the documentation of six nonconfermances.
Verified procedure had been implemented and corrective action had been completed on the six identified nonconform-ances.
l PERSONiCONTACTED l
Company Cl1redan B,,d 8 l ron Oo.
Dates 7//9-22/1991 y
Docket / Report No. 99900o9 7 //fle/
Inspector M d D VI /[e v I
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