IR 05000280/1979057
| ML18136A263 | |
| Person / Time | |
|---|---|
| Site: | Surry  |
| Issue date: | 10/24/1979 |
| From: | Burnett P, Whitener H NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| To: | |
| Shared Package | |
| ML18136A262 | List: |
| References | |
| 50-280-79-57, 50-281-79-75, NUDOCS 7912060235 | |
| Download: ML18136A263 (4) | |
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UNITED STATES NUCLEAR REGULATORY COMMISSION
REGION II
101 MARIETTA ST., N.W., SUITE 3100 ATLANTA, GEORGIA 30303 Report Nos. 50-280/79-57 and 50-281/79-75 Licensee:
Virginia Electric and Power Company Richmond, Virginia 23261 Facility Name:
Surry 1 & 2 Docket Nos. 50-280 and 50-281 License Nos. DPR-32 and DPR-37 Inspected at Surry, Virginia Inspected SUMMARY Inspected on September 18-21, 197 Areas Inspected
'nt;Rsfir;
~@7 Date Signed This special, unannounced inspection involved 27 inspector-hours onsite in the areas of piping support and restraint systems and followup inspection of out-standing item Results Of the two areas inspected, no items of noncompliance or deviations were identifie Z.JS
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DETAILS Persons Contacted Licensee Employees
- W. L. Stewart, Station Manager
- J. L. Wilson, Superintendent Operations
- R. F. Saunders, Superintendent Maintenance
- T. A. Peebles, Superintendent Technical Services
- D. A. Christian, Supervisor Engineering Services M. R. Kansler, Associate Engineer
- E. P. Dewandel, Staff Assistant NRC Resident Inspector
- D. J. Burke
- Attended exit interview Exit Interview The inspection scope and findings were summarized on September 21, 1979 with those persons indicated in Paragraph 1 abov.
Licensee Action on Previous Inspection Findings (Closed) - Unresolved Item (78-13-04) concerned the failure to establish acceptance criteria for correcting snubber functional test data to operating temperature The licensee has stated that work is in progress to develop temperature correction criteria, and they will be available in the near futur Until these criteria are available the licensee is using the temperature correction guidelines issued by the NRC in NUREG 046 This is acceptable to IE and this item is considered resolved for Unit 1 and Unit (Closed) - Unresolved Item (78-13-08) concerned the application of temper-ature correction criteria to snubber functional test dat An engineering evaluation of snubber functional test data (Engineering Study No. 79-31)
dated August 30,1979 indicates that the as left data for lockup and bleed velocities for all snubbers (up to and including a 5-inch-bore size) tested from November 1977 through August 1979 were acceptable at operating temper-ature by the criteria of NUREG 046 For the purpose of this study a maximum operating temperature inside containment of 145 degrees F was assume A temperature survey at operating condition will be made to verify the maximum temperatur Based on the licensee's comparison of Unit 1 test data to the criteria of NUREG 0467 the inspector considers this matter resolve (Open) - Unresolved Item (78-13-05) concerned the identification of snubbers which contain non-ethylene propylene (EP) seal materia The identification of snubbers with non-EP seal material is not yet complete The licensee's commitment is to resolve this.item for Unit 1 by November 1, 197 This item remains unresolve (Open) - Unresolved Item (78-13-06) concerned the need to establish the expected lifetime for seal material which is non-EP. Establishing the expected lifetime of seal material involves the engineering consideration of material characteristics and operating environmen The *licensee has stated this item will be resolved for Unit 1 in conjunction with item (78-13-05).
This item remains unresolve (Closed) - Unresolved Item (78-13-07) concerned the lack of traceability of Unit 1 snubber The licensee now has a computer listing on which snubber mark numbers (locations), serial numbers, and maintenance work numbers are tracke A final verification of the correct listing of mark number versus serial number for Unit 1 will be done during the visual inspection prior to Unit 1 startu Based on the tracking system developed the inspector considers this item resolve.
Unresolved Items Unresolved items were not identified during this inspectio.
Status of Plant Snubbers The licensee has functionally tested all snubbers subject to the technical specification functional ment (i. e., 50,000 pound design load or less).
the test data sheets, and has no further question dition of these snubbers for Unit 1 startu (139) in Unit 1 which are test surveillance require-The inspector reviewed as to the operable con-The data show 35 failures in 139 snubbers or about 25%.
The majority of these (28) failed due to lockup or bleed velocities which were less than the procedure minimum requirement At the time of this inspection the -
licensee believed that either a velocity setpoint drift is occurring or that a test machine problem is yielding inconsistent readings which give the appearance of a setpoint drif At the exit interview the licensee stated that appropriate effort will be expended to resolve the setpoint drift or apparent drift proble The first effort will be to investigate the reliability of the snubber test machin The inspector stated that until the cause of the setpoint drift is clearly understood and corrective action taken to prevent recurrence this issue will be followed* closely with regard to operation beyond a nominal six month cycl.
-3-Large Grinnell Snubbers Current technical specifications exempt snubbers greater than 50,000 pound design load (i. e., greater than 5 inch bore) from periodic functional testin Unit 1 has 22 Grinnell snubbers installed which fall into this categor The inspector asked the licensee if any steps were planned to demonstrate the operability of these large snubber The licensee stated that the difficulty in handling these larger snubbers and the process of y
removal, disassembly, reassembly, purging and reinstallatio~ might actually create problems such as damaged components, leaking seals or air contami-nation in the hydraulic flui In that these units connot be functionally tested to show operability after reassembly, the licensee felt the appro-priate action at this time is to determine the cause of the velocity drift and then to evaluate the need for a major test program on large Grinnell snubbers relative to this informatio.
Followup Items (Open) - Inspector Followup Item (280/79-47-01) concerned determina-tion of the cause for snubber velocity setpoint drif The inspector discussed this item with the licensee and found that the cause of setpoint drift is not yet identifie This item remains ope (Closed) - Inspector Followup Item (280/79-47-02) concerned the need to evaluate the condition of piping systems where snubber failures had occurre The licensee concluded that only 2 of the 35 failures had potential for overstressing the piping during normal station operation.
. These snubbers 1-CC-HSS-356D and 1-RC-HSS-111, were found in the lockup conditio The licensee had the architect engineer perform an analysis with the snubbers acting as rigid restraint This analysis showed that the piping would not be overstressed with the snubbers acting as rigid restraints during normal station operation This item is close Summary of snubber-related unresolved items as discussed in paragraph Item N Unit 1 Unit 2 78-13-04 Closed Closed 78-13-05 Open Open 78-13-06 Open Open 78-13-07 Closed
78-13-08 Closed
78-13-09 Closed
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- These unresolved items were issued relative to a Unit 1 inspection finding.