ML19305E039
| ML19305E039 | |
| Person / Time | |
|---|---|
| Site: | Rancho Seco |
| Issue date: | 04/07/1980 |
| From: | Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| To: | Mattimoe J SACRAMENTO MUNICIPAL UTILITY DISTRICT |
| References | |
| NUDOCS 8004220190 | |
| Download: ML19305E039 (1) | |
Text
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UNITED STATES
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NUCLEAR REGULATORY COMMISSION
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SUITE 202, WALNUT CREEK PLAZA
+,,,e WALNUT CREEK CALIFORNIA 94596 April 7,1980 Docket No. 50-312 Sacramento Municipal Utility District P. O. Box 15830 Sacramento, California 95813 Attention: Mr. John J. Mattimoe Assistant General Manager Gentlemen:
The enclosed Bulletin 80-08 is forwarded to you for action. A written response is required.
If you desire additional information regarding this matter, please contact this office.
Sincerely, l [k A
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R. H. Engelken Director
Enclosure:
1.
Listing of IE Bulletins Recently Issued cc w/ enclosures
- R. J. Rodriguez, SMUD L. G. Schwieger, SMUD 8004220)(O
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r SSIllS fio. : 6820 UNITED STATES Accessions No.:
flVCLEAR REGULATORY COMMISSION 7912190650 0FFICE OF IflSPECTION AfID EtlFORCEMENT WASHINGT0ft, D.C.
20555 April 7,1980 IE Bulletin No. 80-08 EXAMINATION OF C0flTAINMENT LINER PENETRATION WELOS Description of Circumstances:
On March 20-23, 1979, an NRC inspection at Nine Mile Point Unit 2, identified that certain nondestructive examinations performed on containment penetration welds did not satisfy the applicable ASME Boiler and Pressure Vessel (B&PV)
Code requirements. The welds in question were the primary piping containment penetration flued head (integral fitting) to outer sleeve welds which form a part of the containment pressure boundary. The examinations performed included ultrasonic and surface inspections of the outer surface.
Subseouent to the identification of this code problem at Nine Mile Point Unit 2, three welds previously found to be acceptable using ultrasonics were radio-graphed and two revealed indications in excess of the code allowable. The indications revealed by radiography were slag and lack-of-fusion.
Preliminary NRC review indicates that the probable reason the indications were not detected by ultrasonics was due to masking from signals received from th'e backing bar.
As a result of these findings, a complete re-examination program at Nine Mile Point Unit 2 was initiated wherein 10 of 17 welds previously examined and found to be acceptable using ultrasonics, wera re-examined by radiography before rework and found to have indications ex,. :eding ASME Code allowables.
Additional information concerning Beaver Valley Unit 2 and North Anna 3 and 4 has also shown cases of flued head piping penetration weld defects exceeding ASME B&PV Code acceptance criteria when radiographed. Original approved vendor procedures at Beaver Valley Unit 2 did not require volumetric examina-tion. Radiography for information purposes disclosed the unacceptable indica-tions at North Anna 3 and 4. Specification deficiencies have also been discovered at Millstone 3 and River Bend where radiography of these welds was not required.
l The ASME B&PV Code requires radiography of the subject welds with specified exceptions. The licensees and their architect engineer (Stone and Webster) l had specified ultrasonics as the volumetric examination method because, in their judgement, radiography was impractical for the penetration geometry. '
Radiography was successfully performed at North Anna 3 and 4 prior to the identification of this problem and at Beaver Valley 2 and Nine Mile Point 2 sucsequent to NRC inspections. This experience indicates that radiography was meaningful and more practical than UT examination of these penetration welds i
when backing bars are present.
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IE Bulletin No. 80-08 April 7,1980 Page 2 of 2 Action to be Taken by Licensee:
For all power reactor facilities with an operating license or a construction permit:
1.
Determine if your facility contains the flued head design for penetration connections, or other designs with containment boundary butt weld (s) between the penetration sleeve and process piping as illustrated in Figure NE 1120-1, Winter 1975 Addenda to the 1974 and later editions of the ASME B&PV Code.
2.
If an affirmative answer is reached for Item 1, determine the following:
Applicability of the ASME Code including year and addenda and/or a.
b.
Type of nondestructive examinations performed during construction, Type of weld joint (including pipe material and size) and whether or c.
not backing bars were used, d.
Results of construction nondestructive examinations, i.e., if repairs were required, this should be identified including extent of repairs and description of defects encountered during repair, if known.
3.
For those facilities committed during construction to perform volumetric examination of such penetrations through SAR commitments which have not performed radiography, justify not performing radiography or submit plans and schedules for perrorming radiographic examinations.
Within 90 days of the date of this Bulletin, facilities with an operating license or a c;.,nstruction permit shall submit the information requested in Items 1, 2, and 3 of this Bulletin.
Reports shall be submitted to the Regional O' ector with a copy to the Director, Division of Reactor Construction qpection, Washington, D. C.
20555.
Approved by GAO, B180225 (R0072); clearance expires 7-31-80. Approval was given under a blanket clearance specifically for identified generic problems.
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IE Bulletin No. 80-08 Enclosure April 7, 1980 RECEilTLY ISSUED IE BULLETIflS Bulletin Subject Date Issued Issued To No.
80-07 BWR Jet Pump Assembly 4/4/80 All GE BWR-3 and Failure BWR-4 facilities with an OL 80-06 Engineered Safety Feature 3/13/80 All power reactor (ESF) Reset Controls facilities with an OL 80-05 Vacuum Condition Resulting 3/10/80 All PWR power reactor In Damage To Chemical Volume facilities holding Control System (CVCS) Holdup OLs and to those with Tanks a CP 79-01B Environmental Qualification 2/29/80 All power reactor of Class IE Equipment facilities with an OL 80-04 Analysis of a PWR Main 2/8/80 All PWR reactor facilities Steam Line Break With holding OLs and to those Continued Feedwater nearing licensing Addition 80-03 Loss of Charcoal From 2/6/80 All holders of Power Stand:rd Type II, 2 Inch, Reactor Ols and cps Tray Adsorber Cells 80-02 Inadequate Quality 1/21/80 All BWR licenses with Assurance for fluclear a CP or OL 80-01 Operability of ADS Valve 1/11/80 All BUR power reactor Pneumatic Supply facilities with and OL 79-01B Environmental Qualification 1/14/80 All power reactor of Class IE Equipment facilities with an OL 79-28 Possible Malfunction of 12/7/79 All power reactor flamco Model EA 180 Limit facilities with an Switches at Elevated OL or a CP Temperatures