IR 05000338/1981026
| ML20033D219 | |
| Person / Time | |
|---|---|
| Site: | North Anna  |
| Issue date: | 11/10/1981 |
| From: | Economos N, Herdt A NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| To: | |
| Shared Package | |
| ML20033D216 | List: |
| References | |
| 50-338-81-26, 50-339-81-23, NUDOCS 8112070399 | |
| Download: ML20033D219 (5) | |
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UNITED STATES
NUCLEAR REGULATORY COMMISSION o
z REGION 11 q
f 101 MARIETTA ST., N.W., SUITE 3100 ATLANTA, GEORGIA 30303
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Report Nos. 50-338/81-26, 50-339/81-23 Licensee: Virginia Electric and Power Company Richmond, Virginia 23261 Facility Name:
North Anna Docket Nos. 50-338, 50-339 License Nos. NPF-4, NPF-7 Inspection at Nore " Anna ite nea ineral, VA Inspector:
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'D te' Sign'ed Approvecyy:
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A. Hfrd)(, Section Chief Date Signed Enyfnedring Inspection Branch Engineering and Technical Inspection Division SUMMARY Inspection on October 26-28, 1981 Areas Inspected This routine, unannounced inspection involved 31 inspector-hours on site in the areas of licensee actions on previous inspection findings; licensee identified items; flow splitter UT examination results; RC stop valve stud corrosion; service water supply header pipe leak (LER's 81-24,81-46).
Results Within these areas no deviations or violations were identified.
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l PDR ADOCK8112070399 811113
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REPORT DETAILS 1.
Persons Contacted
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Licensee Employees
- W. R. Cartwright, Station Manager
- J. R. Harper, Maintenance Superintendent K. B. Chrisman, Jr., Welding Foreman
- J. Stratten, Mechanical Supervisor
- M. A. Harrison, Resident QC Engineer
- H. L. Travis, NDE Supervisor
- D. L. Smith, Director QA Operations
- D. E. Flemming, Maintenance Engineer NRC Resident Inspector
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M. Shymlock
- Attended exit interview 2.
Exit Interview
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The inspection scope and findings were summarized on October 28, 1981 with those persons indicated in paragraph 1 above. Those findings discussed in detail with the licensee are listed below. The licensee had no dissenting comments.
a.
(0 pen) Unresolved Item 338/81-26-01 Preservice Inspection Records of RC Loop Stop Valve Replacement Studs paragraph 6.
3.
Licensee Action on Previous Inspection Findings a.
(Closed) Violation 338/81-04-01: Indoctrination of Welding Personnel.
Virginia Electric Power Company (VEPCO) letter of ~ response dated April 3,1981 has been reviewed and determined to be acceptable by-
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. Region II.
The inspector held discussions with the maintenance-superintendent and cognizant field supervisor and-examined the
corrective actions as stated in the letter cf response. The inspector concluded that VEPC0 had determined the. full extent of the subject-
noncompliance, performed the.necessary survey and follow-up actions to correct the present conditions and developed the necessary corrective l
actions to preclude recurrence - of similar circumstances.
The corrective actions identified in-the letter of respcnse have been -
e implemented, b.
-(Closed) Violation 338/81-04-02: ' Welding Material Control.
letter of response dated April 3,1981 has been reviewed and determined t
- to be acceptable by Region II. The inspector held discussions with the-
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maintenance superintendent and cognizant field supervisor and examined the corrective actions as stated in the letter of response.
The inspector concluded that VEPCO had determined the full extent of the subject noncompliance, performed the necessary survey and follow-up actions to correct the present conditions and developed the necessary
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i corrective actions to preclude recurrence of similar circumstances.
The corrective actions identified in the letter of response have been implemented.
c.
(0 pen) Unresolved Item 338/81-04-03:
Applicable Welding Code Descrepancies. Discussions with cognizant if t ansee personnel disclosed that field supervision (welding foreman) ha. been provided with copies of welding and pipe fabrication codes. The licensee's welding manual
is undergoing revision; therefore this item will remain open pending its review by RII, 4.
Unresolved Items Unresolved items are matters _ about which more information is required to l
determine whether they are acceptable or may involve noncompliance or devia-
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tions. One new unresolved item identified during this inspection is discus-sed in paragraph 6.
5.
Licensee Identified Items a.
Flow Splitter Inspection As a result of cracking detected in the Unit 2 reactor coolant pump section flow splitters in March 1979, Amendment 10 to license NPF-4 was
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j issued on April 27, 1979 requiring examination of the. Unit I flow
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splitter plates every 18 months (not to exceed 22.5 months).
In February 1981, the licensee conducted ultrasonic tests of all six flow splitters (plates) and identified six indications on the A loop plate (wall side) and several less'significant indications in the other.five (5) plates. Reinspection of these plates conducted on October 15, 1981 showed the indications in Loop A (wall side) flow splitter had grown significantly over the last eight months in that two of the indications -
appeared to have combined and increased in length from 51s inches to a total of 12 inches for a net increase of 6.5 inches. A new indication with a length of approximately seven (7) inches was identified in loop B, ruactor side plate. Indication growth,:but to a lesser degree, was recorded in' loop A and B plates. Also, it was noted that in three of the five plates the indications grew away from the leading edge and towards the center which is contrary to stress analysis calculations.
This analysis _ had predicted that the-indications (cracks) would propogate in the directions of high stress or the leading. edges of the plates and not towards the center.
In discussing this matter th'e inspectors stressed 'the 'need for-establishing a-limiting point for removing the plates in order to avoid
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the costs and delay which will result upon failure. In response the licensee stated that steps have been taken and discussions are underway with W to devise a method for removing.
-b.
(0 pen) 339/78-36-03 High Density Spent Fuel Racks,-Unit 2.
This item refers to a licensee report, S/N666B ' February 7, 1979 on a 10 CFR 5e.55(e) matter concerning the possible weld burn-through and the resulting spatter on the interior surfaces of the High Density l
Spent Fuel Racks of Unit-2.
The report described the planned repair l'
effort (rework) and stated that "This work will be completed prior to-
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installation of the racks in the spent fuel pool." In order to close L
this item the inspectors requested the licensee to produce objective -
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evidence to verify that the " rework" was performed and completed as stated. Cognizant licensee personnel assured the inspectors the work had been performed but requested additional time to retrieve these records. The inspectors stated this item would continue to remain open pending RII review of the aforementioned documents.
c.
(Closed) LER 338/81-024, 81/-046 Service Water Supply Header Pipe Leak.
On May 18 and June 22, 1981 the. licensee reported finding a pinhole type leak in the supply line (3"-WS-74-151-03) to the "B" Service Water Supply Header for Units 1 and 2.
At the time of the report it was suspected that the leak may have been caused by sulfate-reducing i
. bacteria within the service water. piping system..The report stated-l that a study would be conducted to determine the actual tailure. _A review of the metallurgical investigation report disclosed that the leak was caused by bacteria assisted attack.
The report made three recommendations to help alleviate the problem:
(1) water-treatment using sodium hypochlorite - to - kill the bacteria, (2) remove. existing i
deposits from the pipe ' system by using polyacrylamide, (3) reduce
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water aggressiveness by using a polysilicate inhibitor. The licensee i
stated that the corrective action has been implemented. Within these
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areas no deviations or violations.were identified.
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Independent Inspection Effort.
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a.
Preservice Inspection Records of RC Loop Stop Valve Replacement Studs, L
Unit-1.
i Replacement of.the corroded - studs from loop C stop valve.x had been -
completed at the time of this inspection. The' unit was being prepared 1 for resumption to power which. precluded an. inspection of the valve and p
replacement studs.
Two1 of the. corroded studs were sinspected and.
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- photographed;for. future reference.
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- The inspectors reviewed replacement mat'erial quality rec'ords, W Quality -
Release Form: #-21258, receipt: inspection: reports, installation '
procedure..
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and related QA/QC records'.
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Within these areas the inspectors noted that the licensee elected to use the vendor's W,
UT inspection in place of a preservice inspection. In discussing this matter the inspectors requested that the licensee provide a copy of the UT procedure and. records of inspection results and other related documents; e.g.
personnel qualification instrument calibration records etc. The licensee agreed to retrieve these records and stated that the bolts will be UT inspected to VEPCO's UT procedure on a future outage and thereby - establish a new baseline.
The-inspectors stated that this matter would be identified as an unresolved item 338/81-26-01, Replacement RC Stop Valve Bolt Preservice Inspection Report, pending review of the aforementioned vendor UT records by RII on a future inspection.
b.
Steam Generator Support Augmented Inspection.
Visual Inspection of the steam-generator supports was completed _ on October 12, 1981, the inspection was performed using VEPCO procedure 15.1 with results recorded on Form NDT-VT-form 1.
Within the areas inspected no deviations or violations were identified.
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Inspector Followup Items (IFI)
a.
-(Closed) Inspector Followup Item (IFI), 338/81-04-04: Identification lof Welds and Welders on Weldments The licensee, through procedural revision, has provided specific guidelines on this matter to the field, b.
(Closed) IFI 339/78-21 'J1: ISI Procedure 205 Straight Beam Examination.
An indepth review of code requirements on-straight beam examination of pipe welds during ISI inspection has -been conducted. and it has been concluded that Westinghouse procedure ISI-205, is consistant with Code i
requirements.
c.
(0 pen) IFI 338/81-0_4-05: Section XI_ Weld: Repair Program.
The inspectors and the licensee held ' additional discussions ' on Ethis-subject. Following these discussion the licensee agreed to explore the
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matter further.
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(0 pen) IFI 338/81-20-01: 339/81 17-01 ' Radiography of RPV Control Rod
' Drive Penetration Tubes. Discussions with the licensee disclosed.that W has reviewed the ' suspect. radiographs for compliance with applicable -
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code requirements. The licensee stated that W is expected to submit an evaluation' report by November 15 1981. The inspectors stated this
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item would remain open pending a reviewi of the evaluation 'by RII.
. personnel on a future inspection.
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