ML20076C710
| ML20076C710 | |
| Person / Time | |
|---|---|
| Site: | Summer  |
| Issue date: | 07/15/1991 |
| From: | Anthony Mendiola Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML20076C711 | List: |
| References | |
| NUDOCS 9107240063 | |
| Download: ML20076C710 (10) | |
Text
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UNITED $TATES
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SOUTH CAROLINA ELECTRIC & GAS COMPANY SOUTH CAROLINA PUBLIC SERVICE AUTHORITY DOCKET NO. 50-395 VIRGIL C. SUMMER NUCLEAR STATION, UNIT NO. 1 AMENDMENT TO FACILITY OPERATING LICENSE Amendment No. 103 License No. NPF-12 1.
The Nuclear Regulatory Commission (the Commission) has found that:
A.
The application for amendment by South Carolina Electric & Gas Company (the licensee), dated April 23, 1991, as supplemented June 11, 1991, complies with the standards and requirements of the Atomic Energy Act of 1954, as amended (the Act), and the Commission's rules and regulations set forth in 10 CFR Chapter I; B.
The facility will operate in conformity with the application, the provisions of the Act, and the rules and regulations of the Commission; C.
There is reasonable assurance (i) that the activities authorized by this amendment can be conducted without endangering the health and safety of the public, and (ii) that such activities will be conducted in compliance with the Commission's regulations; D.
The issuance of this amendment will not be inimical to the common defense and security or to the health and safety of the public; and E.
The issuance of this amendment is in accordance with 10 CFR Part 51 of the Commission's regulations and all applicable requirements have been satisfied.
2.
Accordingly, the license is amended by changes to the Technical Specifications, as indicated in the attachment to this license amendment; and paragraph 2.C.(2) of Facility Operating License No. NPF-12 is hereby amended to read as fo'ilows:
9107240063 910715 ADOCK 05000395 PDR PDR P
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(2) Technical Specifications and Environmental Protection Plan The Technical Specifications contained in Appendix A, as revised through Amendment No. 103, and the Environmental Protection Plan contained in Appendix B, are hereby incorporated in the license.
South Carolina Electric & Gas Company shall operate the facility in accordance with the Technical Specifications and the Environmental i
Protection Plan.
3.
This amendment is effective as of its date of issuance and shall be If i;aplemented within 30 days of issuance.
FOR THE NUCLEAR REGULATORY COMMISSION gC2c;%.
'j snthony J. Mendiola, Acting Director Project Directorate 11-1 Division of Reactor Projects 1/11 Office of Nuclear Reactor Regulation
Attachment:
Changes to the Technical Specifications Date of issuance:
July 15, 1991 l
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ATTACHMENT TO LICENSE AMENDMENT NO.103 TO FAC1117Y OPERATING LICENSE NO. NPF-1?
DOCKET NO. 50-395 L
Replace the following pages of the Appendix A Technical Specifications with the enclosed pages.
The revised pages are indicated by rnarginal lines.
Rernove Pages insert Pages 3/4 7-16 3/4 7-16 j
i 3/4 7-17 3/4 7-17 3/4 7-18 3/4 7-18 i
3/4 7-20 3/4 7-20 3/4 7-21 3/4 7-21 B3/4 7 4 B3/4 7-4 B3/4 7-5 B3/4 7-5 r
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2.
l PLANT SYSTEMS 3/4.7.7 SNUBBERS LIMITING CONOITION FOR OPERATION 3.7.7 All snubbers on systems required for safe shutdown / accident mitigation shall be OPERABLE.
This includes safety and non-safety related snubbers on systems used to protect the code boundary and to ensure the structural integ-rity of these systems under dynamic loads.
APPLICABILITY:
MODES 1, 2, 3 and 4.
MODES 5 and 6 for snubbers located on systems required OPERABLE in those MODES.
ACTION:
With one or more snubbers inoperable, within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> replace or restore the inoperable snubber (s) to OPERABLE status and perform an engineering evaluation per Specification 4.7.7.g on the attached component or declat e the attached system inoperable and follow the appropriate ACTION statement for that system.
SURVEILLANCE REQUIREMENTS 4.7.7 Each snubber shall be demonstrated OPERABLE by performance of the following augmented inservice 1spection program and the requirements of 4
Specification 4.0.5.
a.
Inspection Types As used in this specification, type of snubber shall mean snubbers of the same design and manufacturer, irrespective of capacity.
b.
Visual Inspections Snubbers are categorized as accessible or inaccessible during power operation.
Each of these categories may be inspected independently according to the schedule determined by Table 4.7-2.
The visual inspection interval for each category of snubber shall be determined based on the criteria provided in Table 4.7-2, and the first inspec-tion interval determined using this criteria shall be based upon the previous inspection interval as established by the requirements in effect before Amendment No. 103.
t c.
Refueling Outage Inspections Each refueling outage an inspection shall be performed of all the l
snubbers defined in Section 3.7.7 attached to sections of safety t
l systems piping that have experienced unexpected, potentially damag-l ing transients as determined from a review of operational data and a visual inspection of the systems.
In addition to satisfying the l
visual inspection acceptance criteria, freedom of motion of mechani-cal snubbers shall be verified using at least one of the following:
SUMMER - UNIT 1 3/4 7-16 Amendment No. H, 103 l
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vlANT SYSTEMS SURVEILLANCE REQUIREMENTS (Continued)
(i) manually induced snubber movement; (ii) evaluation of in place snubber piston setting; or (iii) stroking the mechanical snubber through its full range of travel.
d.
Visual Inspection Acceptance Criteria Visual inspections shal! verify (1) that there are no visible indica-tions of damage or impaired OPERABILITY and (2) attachments to the foundation or supporting structure are functional, and (3) fasteners for the attachment of the snubbers to the component and to the snubber anchorage are functional.
Snubbers which appear inopereble as a re-sult of visual inspections shall be classified as unacceptable and may be reclassified acceptable for the purpose of establishing the next visual inspection interval, provided that (i) the cause for being classified as unacceptable is clearly established and remedied for that particular snubber and for other snubbers irrespective of type that may be generically susceptible; and (ii) the affected snubber is l
functionally tested in the as found condition and determined OPERABLE per Specifications 4.7.7.f.
When a fluid port of a hydraulic snubber is found to be uncovered the snubber shall be declared inoperable and shall not be determined OPERABLE via functional testing unless the test is started with the piston in the as found setting, extending the piston rod in the tension mode direction.
All snubbers found connected to an inoperable common hydraulic fluid reservoir shall be counted as unacceptable and may be reclassified as acceptable for determining the next inspection interval provided that criterion (i) and (ii) above are met.
A review and evaluation shall be performed and documented tn justify continued operation with an unacceptable snubber.
If continued operation cannot be justified, the snubber shall be declared inoperable and the ACTION requirements of 3.7.7 shall be met, e.
Functional Tests During the first refueling shutdown and at least once per 18 months thereaf ter during shutdown, a representative sample of either:
(1) At least 10% of the total of each type of snubber in use in the plant shall be functionally tested either in place or in a bench test.
For each snubber of a type that does not meet the functional test acceptance criteria of Specification 4.7.7.f, an additional 10% of that type of snubber shall be functionally tested untii no more failures are found or until all snubbers of that type have been functionally tested, or (2) A representative sample of each type of snubber shall be functionally tested in accordance with figure 4.7-1, "C" is the total nu%er of snubbers of a type found not meeting the acceptance requirements of Specification 4.7.7.f.
The cumulative number of snubbers of a type tested is denoted by "N."
At the end of each day's testing, the new values of "N" and "C" (previous day's total plus current day's increments) shall be plotted on Figure 4.7-1.
If at any time the point plotted falls in l
the " Accept" region testing of that type of snubber may be terminated.
SUMMER - UNIT 1 3/4 7-17 Amendment No. 47,103 l l
PLANT SYSTEMS a
SURVEILLANCE REQUIREMENTS (Continued)
)
e.
Functional Tests (Continued)
When the point plotted lies in the " Continue Testing" region, addi-tional snubbers of that type shall be tested until the point falls in the " Accept" region or all the snubbers of that type have been tested.
l The representative sample selected for functional testing shall include the various configurations, operating environments, and the range of size and capacity of snubbers of each type.
The represen-tative sample shall be weighted to include more snubbers from severe service areas such as near heavy equipment.
Snubbers placed in the same location as snubbers which failed the previous functional test shall be included in the next test lot if the failure analysis shows that failure was due to location, f.
Functional Test Acceptance Criteria The snubber functional test shall verify that:
1.
Activation (restraining action) is achieved within the specified range in both tension and compression, except that inertia dependent, acceleration limiting mechanical snubbers, may be tested to verify only that activation takes place in both directions of travel.
2.
Snubber bleed, er release rate where required, is present in both tension and compression, within the specified range.
3.
Where required, the force required to initiate or maintain motion of the snubber is within the specified range in both direction of travel.
4.
For snubbers specifically required not to displace under continuous load, the ability of the snubber to withstand load without displacement.
5.
Fasteners for attachment of the snubber to the component and to the snubber anchorage are secure.
Testing methods may be used to measure pararaeters indirectly or parameters other than those specified if those results can be correlated to the specified parameters through established methods.
g.
Functional Test failure Analysis An engineering evaluation shall be made of each failure to meet the functional test acceptance criteria to determine the cause of the i
failure.
The results of this evaluation shall be used, if applicable, in selecting snubbers to be tested in an effort to determine the j
OPERABILITY of other snubbers irrespective of type which may be subject to the same failure mode.
SUMMER - UNIT 1 3/4 7-18 Amendment No.103 l
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10 9
8 7
6 C
5 CONTINUE TESTINC 2
ACCEPT 0
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0 10 20 30 40 50 60 70 80 90 100 N
FIGURE 4.7-1 SAMPLING PLAN FOR SNUBBER FUNC'lIONAL TEST SUMMER - UNIT 1 3/4 7-20 Amendment No.103
TABLE 4.7-2 SNUBBER VISUAL INSPECTION INTERVAL NUMBER OF UNACCEPTABLE $NUBBERS Population Column A Column B Column C or Category Extend Interval Repeat Interval Reduce Interval (Notes 1 and 2)
(Notes 3 and 6)
(Notes 4 and 6)
(Notes 5 and 6) 1 0
0 1
80 0
0 2
100 0
1 4
150 0
3 8
200 2
5 13 300 5
12 25 400 8
18 36 500 12 24 48 750 20 40 78 1000 or greater 29 56 109 TABLE NOTATION (1) The next visual inspection interval for a snubber population or category size shall be determined based upon the previous inspection interval and the number of unacceptable snubbers found during that internal.
Snubbers may be categorized, based upon their accessibility during power operation, as accessible or inaccessible.
These categories may be examined separately r
orjointly.
However, the licensee must-make and document that decision before any inspection and shall use that decision as the basis upon which to determine the next inspection interval for that category.
(2) Interpolation between population or category sizes and the number of unacceptable snubbers is permissible.
Use next lower integer for the value of the limit for Columns A, B, or C if that includes a fractional value of unacceptable snubbers as determined by interpolation.
(3)
If the number of unacceptable snubbers is equal to or less than the number in Column A, the next inspection interval may be twice the previous interval I
I but not greater than 48 months.
(4)
If the number of unacceptable snt.bbers is equal to or less than tha number in Column B but greater than the number in Column A, the next inspection interval shali be the same as the previous interval.
(5)
If the number of unacceptable snubbers is equal to or greater than the num-ber in Column C, the next inspection interval shall be two-thirds of the I
previous interval.
However, if the number of unacceptable snubbers is less I
than the number in Column C but greater than the number in Column B, the next interval shall be reduced proportionally by interpolation, that is, I.
the previous interval shall be reduced by a factor that is one-third of the ration of the difference between the number of unacceptable snubbers found during the previous interval and the number in Column B to the difference in the numbers in Columns B and C.
(6) The provisions of Specification 4.0.2 are applicable for all inspection intervals up to and including 48 months.
SUMMER - UNIT 1 3/4 7-21 Amendment No.103
PLANT SYSTEMS BASES ULTIMATE HEAT SINK (Continued) 1 The limitations on minimum water level and maximum temperature are based on providing a 30 day cooling water supply to safety related equipment without exceeding their design basis temperature and is consistent with the i
recommendations of Regulatory Guide 1.27, " Ultimate Heat Sink for Nuclear Plants", March 1974.
3/4.7.6' CONTROL ROOM NORMAL-AND EMERGENCY AIR HANDLING SYSTEM
.The OPERABILITY of the control room ventilation system ensures that 1)-the ambient air temperature does not exceed the allowable temperature for continuous duty rating for the equipment and instrumentation cooled by this system and 2) the control room will remain habitable for operations personnel during and following all credible accident conditions.
The OPERABILITY of this system in conjunction with control room design provisions is based on limiting the radiation exposure to personnel occupying the control. room to
- 5. rem or less whole body, or its equivalent.
This limitation is consistent with the requirements of General Design Criteria 19 of Appendix "A", 10 CFR 50, 3/4.7.7 SNUBBERS All snubbers on systems required for safe shutdown / accident mitigatioa shall be OPERABLE.
This includes safety and non-safety related snubbers on systems used to protect the code boundary and to ensure the structural integrity of these systems under dynamic loads.
Snubbers are classified and grouped by design and manufacturer but not by size.
Forexample,mechanicalsnubbersutilizingthesamedesignfeaturesof the 2 kip,10 kip and 100 kip capacity manufactured by company A" are of the same type.
The same design mechanical snubber manufactured by company "B" for the purposes of this specification would b of a different type, as would hydraulic snubbers from tither manufacturer.
The visual inspection frequency is based upon maintaining a constant level of snubber protection to systems.
Therefore, the required inspection interval varies inversely with the observed snubber failures and is determined by-the number of inoperable snubbers found during an inspection, Table 4.7-2 establishes three limitt for determining the next visual inspection interval.
Inspections performed before that interval has elapsed may be used as a new reference point to determine the next inspection.
Any inspection whose results require a shorter inspection interval will override the previous schedule.
SUMMER - UNIT 1 B 3/4 7-4 Amendment No. O,103
PLANT SYSTEMS BASES SNUBBERS (Continued)
To provide assurance of snubber functional reliability one of two sampling and acceptance criteria inethods are used:
1) functionally test 10 percent of a type of snubber with an additional 10 percent tested for each functional testing failure, or 2) functionally test a sample size and determine sample acceptance using Figure 4.7-1.
Figure 4.7-1 was developed using "Wald's Seouential Probability Ratio Plan" as described in " Quality Control and Industrial tatistics" by Acheson J. Duncan.
The service life of a snubber is establishei via danufacturer input and information through consideration of the snubber servite conditions and associated installation and maintenance records (newly installed snubber, seal replaced, spring replaced, in high radiation area, in high temperature area, etc...).
The requirement to monitor the snubbe.' servi e life is included to ensure that the snubbers periodically undergo a pe formaace evaluation in view of their age and operating conditions.
These record will provide statistical bases for future consideration of snubber service life.
The requirements for the maintenance of records and the snubber service life review are not intended to affect plant operation.
Permanent or other exemptions from the surveillance program for individual snubbers may be granted by the Commission if a justifiable basis for exemption is presented and, if applicable, snubber life destructive testing was performed to qualify the snubber for the applicable design conditions at either the completion of their fabrication or at a subsequent date.
Snubbers so exempted shall be listed in Section 3.7.7 with footnotes indicating the extent of the exemptions.
SUMMER - UNIT 1 B 3/4 7-5 Amendment No. O, 103
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