ML20235A318
| ML20235A318 | |
| Person / Time | |
|---|---|
| Site: | Rancho Seco |
| Issue date: | 12/31/1987 |
| From: | Andognini G SACRAMENTO MUNICIPAL UTILITY DISTRICT |
| To: | Miraglia F Office of Nuclear Reactor Regulation |
| References | |
| GCA-87-803, NUDOCS 8801120197 | |
| Download: ML20235A318 (6) | |
Text
gSMUD SACRAMENTO MUNICIPAL UTILITY DISTRICT C P. O. Box 15830, Sacramento CA 95852-1830.(916) 452-3211' AN ELECTRIC SYSTEM SERVING THE HEART OF CALIFORNIA DEC 311937 GCA 87-803 U.
S.
Nuclear Regulatory Commission Attn:
Frank J. Miraglia, Jr.
Associate Director of Projects Phillips Building 7920 Norfolk Avenue Bethesda, Md. 20014 DOCKET NO. 50-312 RANCHO SECO NUCLEAR GENERATING STATION LICENSE NO. DPR-54 i
RESPONSE TO MAINTENANCE INSPECTION CONDUCTED ON FEBRUARY 9-13, 1987
Dear Mr. Miraglia:
The following is the District's response to Mr.
Dennis Crutchfield's
- letter, dated August 26,
- 1987, regarding the results of chemical analysis and material testing of fasteners obtained during a maintenance inspection conducted on February 9-13, 1987, at the Rancho Seco Nuclear Generating Station.
The District's response is as follows:
1)
Request:
A description of the steps that have been or will be taken to determine the extent of this problem and to assure that nonconforming material is not in use or in storage, Response: As a part of inspection activities by the NRC at Rancho Seco in February 1987, two bolts were found to have chemical and physical properties which did not comply with appropriate ASTM standards.
The NRC's report stated that the samples were drawn from stock used in safety related applications.
In actual fact, bolt sample numbers S0-3 and S0-5 were taken from Class II stock since there were no Class I
bolts at Rancho Seco of the type requested.
(Rancho Seco stock code 026736 size 5/8" x 2 3/4").
q 8801120197 871231 b
t g' PDR ADOCK 05000312 U
l G
PDR RANCHO SECO NUCLEAR GENERATING STATION O 14440 Twin Cities Road, Herald, CA 95638-9799;(209) 333 2935
DEC 311937 Mr. Miraglia ~
GCA 87-803 The bolts in question have head markings CB/B-7 and are listed in the District's inventory as
" ASTM A-193, B-7" bolts even though there were no certified material test reports (CMTR's) or certificates of conformance on file attesting to conformance to the standard.
Therefore, the bolts would have only been used in a quality Class II application requiring bolts conforming to the ASTM standard.
This is significant because it indicates there is no direct nuclear safety Concern.
The following describes the steps the District has taken to determine the extent of this problem:
1)
From the identification marks on the bolts it was determined that they were manufactured by Clark Brothers Bolt
- Company, a
U.S.
manufacturer.
The bolts are suspected to have been made from AISI-1008 to 1010 steel instead of AISI 4140 or - 4145 steel and are not suitable for either high temperature or high strength use which is the intended application defined in the ASTM standards.
2)
A computer search of the District's inventory was performed to identify all stock codes with a description including the words bolt or cap screw.
Each stock item was then physically inspected for evidence of markings indicating manufacture by Clark Brothers Bolt Co.
This amounted to a physical inspection of eight hundred and eighty-eight (888) stock codes.
One additional stock item was found to have CB head markings (Rancho Seco stock code 025436, size 1" x 12").
In
- summary, two stock codes (025436 and 026736) were identified with suspect bolts.
Using the stock code records it was possible to identify the bolt's source, quantity and disposition.
DEC 311937 Mr. Miraglia GCA 87-803 A.
The history for stock code 026736 bolts is as follows:
Thirty-two (32) bolts were turned over from Westinghouse, (contract Number 5338), on credit number 41284 on 08/02/7/.
An additional 32 bolts were purchased from Westinghouse on Purchase order number RS35449 on 08/24/82.
Disposition of the 64 bolts is as follows:
BOLT HEAD MARKING QUANTITY DESCRIPTION I/BS 30 Quantity on hand.
(Not Clark Brothers)
CBB7 2
In quarantine.
CBB7 4
Issued to the NRC on 02/12/87.-
CBB7 8
Bolts issued 08/10/82 on Issue Request No. 045681 for QA Class II valve HV-67102.
Bolts removed' 11/21/87 per Work Request 137114.
CBB7 8
Bolts issued 08/10/82 on Issue Request No. 045651 for QA Class II valve HV-61202.
Bolts removed 11/21/87 per Work Request 137106.
unknown 4
Issued 06/22/81 on Issue Request No. 48620 to QA Class II spare transformer X98C - not installed on equipment.
unknown 8
Issued 10/03/81 on Issue Request No. 40365 to QA Class II low pressure turbine K-303A - not installed on equipment.
64 Total -
Total of bolts obtained for SC No.
026736.
l
DEC 31 1937 Mr. Miraglia GCA 87-803 In no cases were the subject bolts issued for work requests on QA Class I equipment.
The twelve bolts issued to the field on Issue request No's 48620 and 40365 for non safety related equipment were not installed, as determined by visual inspection for bolts with I/BS or CBB7 head markings.
It is probable the bolts were used for special tooling, or temporary piping in support of the subject work requests, and were subsequently scrapped upon completion of maintenance.
B.
The history for stock code 025436 bolts is as follows:
16 bolts were turned over to Rancho Seco inventory from Westinghouse on 10/15/76.
8 bolts were turned Ier to Rancho Seco inventory on 02/22/77.
Both caces are associated with contract number 5538 for replacement Feed Water Heaters.
None of the 24 stock code 025436 bolts were ever issued, and are physically accounted for.
Since all of the Clark Brothers bolts in the SMUD inventory were received from Westinghouse, the problem appears confined to QA Class II bolts furnished to SMUD via Westinghouse.
Other bolts intended for Class I service have been received with CMTR's or C.O.C.'s which were verified to comply with applicable code or standard requirements.
The substandard Clark Brother bolts will be disposed of following completion of all investigations and evaluations.
In summary, Rancho Seco material control practices precluded issue of the subject bolts for work on safety related equipment.
2)
Request:
A description of the steps that have been or will be taken to prevent recurrence; Response: As part of a comprehensive effort to enhance material control at Rancho Seco, the following steps are being taken:
4 m___.______.__
f I
i DEC 31 1%7 Mr. Miraglia GCA 87-803 l
A.
.During the 1986/87 outage the District' completed.a reorganization of the materials management program,'
which included consolidating responsibilities under a.
single manager and implementing a series of new andL 1
comprehensive administrative procedures. 1These procedures, which have been implemented by1a dedicated team, provida a high level of assurance'.that materials-are being-procured in accordancefwith applicable standards and installed in accordance with the plant's
{
design bases.-. Currently a.100% inventory.of the entire warehouse stock is complete.. Verification of all 4
quality Class I stock items to current standards is in process and is. scheduled to be completed 09/30/88-I l
B.
As part of the improvements in the Districts materials
)
management program theLClass I bolting has been i
completely separated from Class-II bolting and
]
carefully inventoried to assure there is no co-i mingling.
This should provide even greater assurance that Class II bolts will not be issued for Class I applications.
C.
Additionally, the generic issue of substandard bolting.
is being addressed by IE Bulletin 87-02.-
~IE Bulletin 87-02 requires sampling and testing of Class I and II-bolting, which is currently in progress.- The testing will be completed within the 60 day time period-required by the bulletin, Land the results forwarded to the NRC.
3)
Request:
The dates your corrective' action and' preventive measures were or will be completed.
t Response: The subject bolts have been replaced in the-previously identified Class II equipment.
All bolt type stock codes have been visually, inspected for Clark Brothers marked bolts. 'Other preventive measures.will be completed as stated in Response to Request #2.
1 l
ij i
a.
DEC31 E87 Mr. Miraglia GCA 87-803 Please contact me if you have any questions.
Members of your staff with questions requiring additional information or clarification may contact Steve Howze of the Licensing Department at (916) 452-3211, extension 4921.
.)
l Sincerely,
/
i g
G.
Carl Andogn ni Chief Executi'e Officer, Nuclear cc:
G.
Kalman, NRC, Bethesda A.
D'Angelo, NRC, Rancho seco J.
B. Martin, NRC, Region V i
q
____-_-__A