ML20155D556
| ML20155D556 | |
| Person / Time | |
|---|---|
| Site: | South Texas  |
| Issue date: | 10/29/1998 |
| From: | HOUSTON LIGHTING & POWER CO. |
| To: | |
| Shared Package | |
| ML20155D555 | List: |
| References | |
| NUDOCS 9811030244 | |
| Download: ML20155D556 (25) | |
Text
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ST-NOC-AE-000262 Page1 Annotated Technical Specification and Bases Pages Annotated Technical Specification and Bases Pages Enclosed 3
ix xiv 3/4 7-21 3/4 7-22 3/4 7-22a 3/4 7-22b 3/4 7-23 3/4 7-24 3/4 7-25 3/4 7-26 B 3/4 7-4 B 3/4 7-5 B 3/4 7-6 4
9811030244 981029 PDR ADOCK 05000498 P
INDEX
.LIMiTINGCONDIT0NSFOROPERATIONANDSURVEILLANCERE0VIREMENTS SECTION f1(il 3/4.6.3 CONTAINMENT ISOLATION VALVES............................. 3/4 6-18 3/4.6.4 COM8USTIBLE GAS CONTROL Hydrogen An alyzers....................................... 3/4 6-19 Electric Hydrogen Recombiners............................ 3/4 6-20 3 /4.7 PLANT SYSTEMS 3/4.7.1 TURBINE CYCLE S a fe ty Val ve s............................................ 3 /4 7-1 TABLE 3.7-1 MAXIMUM ALLOWABLE POWER RANGE NEUTRON FLUX HIGH SETPOINT WITH INOPERABLE STEAM LINE SAFETY VALVES DURING 4 LOOP OPERATION......................................... 3/4 7-2 TABLE 3.7-2 STEAM LINE SAFETY VALVES PER LOOP..................... 3/4 7-3 Auxiliary Feedwater System............................... 3/4 7-4 Auxiiiary Feedwater Storage Tank......................... 3/4 7-6 Specific Activity........................................ 3/4 7-7 TABLE 4.7-1 SECONDARY COOLANT SYSTEM SPECIFIC ACTIVITY SAMPLE AND ANALYSIS PROGRAM..................................... 3/4 7-8 Main Steam Line Isol ation Valves......................... 3/4 7-9 Atmospheric Steam Relief Valves.......................... 3/4 7-10 Main Feedwater System.................................... 3/4 7-10a l
3/4.7.2 STEAM GENERATOR PRESSURE / TEMPERATURE LIMITATION.......... 3/4 7-11 3/4.7.3 COMPONENT COOLING WATER SYSTEM........................... 3/4 7-12 3/4.7.4 ESSENTIAL COOLING WATER SYSTEM........................... 3/4 7-13 3/4.7.5 ULTIMATE HEAT SINK....................................... 3/4 7-14 3/4.7.6 (This specification number is not used.)
3/4.7.7 CONTROL ROOM MAKEUP AND CLEANUP FILTRATION SYSTEM........ 3/4 7-16 3/4.7.8 FUEL HANDLING BUILDING (FHB) EXHAUST AIR SYSTEM......... 3/4 7-19 3/4.7.9
-SN9BBEM b.I.S.P.59b5'90.h*H.MMbr./A b.d.M
....... -3r/4-7-et-FIGUst 4.i-4 5AHPLE Fu0i 2) FOR 5NOBBER FUNCTiGNAi. TEu........... 3/4 MC 3/4.7.10 SEALED SOURCE CONTAMINATION.............................. 3/4 7-27 3/4.7.11 (This specification number is not used.)
3/4.7.12 (This specification number is not used.)
3/4.7.13 AREA TEMPERATURE MONITORING.............................. 3/4 7-31 TABLE 3.7-3 AREA TEMPERATURE MONITORING........................... 3/4 7-32 3/4.7.14 ESSENTIAL CHILLED WATER SYSTEM........................... 3/4 7-33 SOUTH TEXAS - UNITS 1 & 2 ix Unit 1 - Amendment No. 67 Unit 2 - Amendment No. 56
4 INDEX BASES SECTION PAGE 3/4.4.9 PRESSURE / TEMPERATURE LIMITS...............................
B 3/4 4-6
- TABLE B 3/4.4-la REACTOR VESSEL TOUGHNESS (UNIT 1)................
B 3/4 4-9 TABLE B 3/4.4-1b REACTOR VESSEL TOUGHNESS (UNIT 2)................
B 3/4 4-10 FIGURE B 3/4.4-1 FAST NEUTRON FLUENCE (E>1MeV) AS A FUNCTION OF FULL POWER SERVICE LIFE..................................
B 3/4 4-11 3/4.4.10 STRUCTURAL INTEGRITY.....................................
B 3/4 4-15 3/4.4.11 REACTOR VESSEL HEAD VENTS................................
B 3/4 4-15 3/4.5 EMERGENCY CORE COOLING SYSTEMS 3/4.5.1 ACCUMULATORS..............................................
B 3/4 5-1 3/4.5.2 and 3/4.5.3 ECCS SUBSYSTEMS...............................
B 3/4 5-1 3/4.5.4 (This specification number is not used)...................
B 3/4 5-2 3/4.5.5 REFUELING WATER STORAGE TANK..............................
B 3/4 5-2 3/4.5.6 RESIDUAL HEAT REMOVAL (RHR) SYSTEM.......................
B 3/4 5-3 3/4.6 ' CONTAINMENT SYSTEMS 3/4.6.1 PRIMARY CONTAINMENT.......................,...............
B 3/4 6-1 3/4.6.2 DEPRESSURIZATION AND COOLING SYSTEMS......................
B 3/4 6-3 3/4.6.3 CONTAINMENT ISOLATION VALVES..............................
B 3/4 6-4
-3/4.6.4 COMBUSTIBLE GAS CONTR0L...................................
B 3/4 6-4 3/4.7 PLANT SYSTEMS 3/4.7.1 TURBINE CYCLE.............................................
B 3/4 7-1 3/4.7.2 STEAM GENERATOR PRESSURE / TEMPERATURE LIMITATION...........
B 3/4 7-3 d
3/4.7.3 COMPONENT COOLING WATER SYSTEM............................
B 3/4 7-3 3/4.7.4 ESSENTIAL COOLING WATER SYSTEM............................
B 3/4 7-3 3/4.7.5 ULTIMATE HEAT SINK........................................
B 3/4 7-3 3/4.7.6 (Not used) 3/4.7.7 CONTROL ROOM MAKEUP AND CLEANUP FILTRATION SYSTEM.........
B 3/4 7-4 3/4.7.8 FUEL HANDLING BUILDING EXHAUST AIR. SYSTEM.................
B 3/4 7-4 3/4=7.s- ::... -.......ficR h'ow M w b..........f...... h.........
(This speci er is no use SOUTH TEXAS - UNITS 1 & 2 xiv Unit I - Amendment No. 4 e
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PLANT SYSTEMS
%sk %eA) 3/4.7.9 fSNUBBERS fLIMITIN CONDITION FOR OPE
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3.7.9 All snubbers s be OPERABLE. The only snubbers cluded'from the requirements are t e installed on nonsafety-related sys'tems and then only if their failure or ailure of the system on which they fe installed would have no adverse ef ct on any safety-related system.
APPLICA ITY: H00ES 1, 2, 3, and 4.
MODES nd 6 for snubbers located on syste required OPERABLE in those MODES.
ION:
l With one or more snubbers inopera e on any system, within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> replace restore the inoperable snubber to OPERABLE status and perform an engine ng 4
evaluation per Specification
.7.99. on the attached component or declar the attached system inoperable nd follow the appropriate ACTION statement or that system.
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j SURVETLLANCE RE0VIR MENTS 4.7.9 Each s er shall be demonstrated OPERABLE by formance of the following ay ented inservice inspection ~ program in liWof the requirements of I
1 Specifica on 4.0.5.
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Inspection Tvoes
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As used in this specification, typ'e of snubber shall mean snubbers of the samo design and manufactur.er, irrespective of capacity.
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Visual Insoections Snubbers are categorizeil as inaccessible or accessible during r ctor operation. Each of these categories (Inaccessible and Acces e)-
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may be inspected independently or jointly according to the4chedule determined by Table 4.7-2.
The visual inspection intervaT for each population orAategory of snubber shall be determined b'ased upon the criteria provided in Table 4.7-2 and the first inspec ion in.terval determined'using this criteria shall be based upop4he prepious inspection interval as established by the requirements *in.effect before amendment nos. 44 and 33.
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SOUTH TEXAS - UNITS 1 & 2 3/4 7-21 Unit 1-AmendmentNo.[4 Unit 2 - Amendment No. ly I
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TABLE 4.7-2 SNUB 8ER VISUAL. INSPEC INTERVAL y
ER OF UNACCEPTABLE SNUBBERS Population Column A Column B Column C or Category Extend In val Repeat Interval Reduce Interya (Notes 1 and 2)
(Notes 3 nd 6)
(Notes 4 and 6)
(Notes 5 and 6)
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1 0
0 80 0
0 2
l' 100 0
1 4
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0
.0 3
8 200 2
5 13
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300 5
12 25
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400 8
18 36
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500 2
24 48 '
7 l
750 20 40
'i8 l
l 1000 or greate 29 i
56
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109
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ext visual inspection interval for a snublief population or l
Note 1: The l
c3t ory size shall be determined based upon the previous inspection l
nterval and the number of unacceptable spubbers found during that interval. Snubbers may be categorized. based upon their accessibility during power operation, as accessible 4r inaccessible. These categories may be examined separate 19 or jointly. However, the
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licensee must make and document h'at decision tmfore any inspection l
and shh11 use that decision a e basis upon which to determine the next inspection interval fo at category.
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Note 2:
Interpolation between p9pulation or category sizes and the number of unacceptable snubbers,is permissible. Use next lower integer for the value of the limit fo'r Columns A, B, or C if that integer includes a l
fractional value of unacceptable snubbers as determined by l
interpolation. /
f unacceptable snubbers is equal to or less than'Ihe Note 3:
If the numbe number indolumn A, the next inspection interval may be twice the previops interval but not greater than 48 months.
SOUTH TEXAS - UNITS 1 & 2 3/4 7-22 Unit 1 - Amendment No.
Unit 2 - Amendment No.
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i Table 4.7-2 idntdued)
SNUBBER VISUAL IK5PECTION INTERVAL Note 4:
If the number of una ptable snubbers is ual to or 1 (s than the number in Column B ut greater than the nu erinColynA,thenext inspection inter shall be the same as the previou interval.
Note 5:
If the nu f of unacceptable snubbers is equal o or greater than the n in Column C, the next inspection i rval shall be two-thirds the previous interval. However, the number of unacge' table snubbers is less than the nu r in Column C but greater thyrf tte number in Column B, the next ip rval shall be reduced foportionally by interpolation, that Js, the previous interval shall
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be reduced by a factor that is one-tjiird of the ratio of the difference between the number of u teceptable snubbers found during the previous interval and the nu er in Column B to the difference I
the numbers in Columns B and C t
Note 6:
The provisions of Specifi tion 4.0.2 are applicable for all inspection intervals up) and including 48 months.
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. SOUTH TEXAS - UNITS 1 & 2 3/4 7-22a Unit 1 - Amendment No.
Unit 2 - Amendment No.
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.SVRVEILLANCERE0VIREMENTS(Conbued) c.
Visual Insoect Accentance Criteria Visual in etions shall verify that:
(1) the snubber as no visible indicat ns of damage or impaired OPERABILITY, (2) achments to the found ion or supporting structure are functional and (3) fasteners for ttachment of the snubber to the com)onent d to the snubber chorage are functional. Snubbers whici ap r inoperable as a esult of visual inspections shall be clas led as unacce) table and may be reclassified acceptable for the p pose of establis11ng the next visual inspection interval, provi d that:
(1) the cause of the l
l rejection is clearly established and emedied for that particular snubber and for other snubbers irr pective of. type that may be generically susceptible; and (11 the affected snubber is lt i
i functionally tested in the as-und condition and determined OPERABLE i
per Specification 4.7.9f.
snubbers found connected to an l
l inoperable common hydrauli fluid reservoir shall be counted as l
unacceptable and may be eclassified as acceptable for determining
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l the next inspection i erval provided that criteria (i) and (ii) abo"e are met. Ar ew and evaluation shall be performed and der nented to just) y continued operation with an unacceptable i
If co inued operation cannot be justified, the snubber /
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d inoperable and the ACTION requirements shall sh I be deci i
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Transien Event Insoection; l
An i ection shall be performed of all snubbers attac to sections of systems that have experienced unexpected, potential y damaging ransients as determined from a review of operatio ai data and a visual inspection of the systems within 6 months ollowing such an l
event.
In addition to satisfying the visual i pection acceptance
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criteria, freedom-of-motton of mechanical sn ers shall be verified using at least one of the following:
(1) nually induced snubber movement; or (2) evaluation of in-place bber piston setting; or (3) stroking the mechanical snubber thr gh its full range of travel.
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l SOUTH TEXAS - UNITS 1 & 2 3/4 7-22b Unit 1 - Amendment No.
4 Unit 2 - Amendment No.
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SURVEILLANCE REOUIREMENTS (ContEnued)
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Functional Test During the rst refueling shutdown and at least once r 18 months thereaft during shutdown, a representative sample snubbers of each t e shall be tested using one of the followl sample plans.
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The ple plan for each type shall be selected for to the test
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p od and cannot be changed during the test p lod. The NRC Regional l
dministrator shall be notified in writing o the sample plan selected for each snubber type prior to the test r.e od or the sample plan i
used in the prior test period shall be i lesented:
1)
At least-10% of the-total of e
-type 'of snubber shall be functionally tested either i place or in a bench test. For each snubber of a type tha does not meet the functional test acceptance criteria of S cification 4.7.9f., an additional 10%
of that type of snubb shall be functionally tested. until no more failures are f nd or until all snubbers of that type have been functionally ested; or 2)
A representat,i e sample of each type of snubber shall be nc-tionally tpsted in accordance with Figure 4.7-1.
"C" J the 1
total nupber of snubbers of a type found not meeting 4he accept-i ance quirements of Specification 4.7.9f.
The cudiulative i
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num of snubbers of.a type tested is denoted 'y "N".
At the e
of each day's testing, the new values o N" and "C" (pre-tous day's total plus current day's iner ents) shall be i
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plottedonFigure4.7-1.
If at any tipe the point plotted falls in the Reject" region, all snubbers of that type shall befunctionall{ tested.
If at any41me the point plotted falls in the " Accept region, testing 4if snubbers of that type may be terminated. When the point,piotted lies in the " Continue Testing" region, additio 1 snubbers of that type shall be tested until the point is in the " Accept" region cr the
" Reject" region, or 1 the snubbers of that type have been tested; or 3)
An initial repr sentative sample of 55 snubbers shall be fun i
tionally tested.
For each snubber type which does not me the functionaldest acceptance criteria, another sample of least one-half /the size of the initial sample shall be test until the tofal number tested is equal to the initial s e size mul,tiplied by the factor,1 + C/2, where "C" is th number of bbers found which do not meet the functiona dest acceptance criteria. The results from this sample plan all be plotted using an " Accept" line which follows the eq ation N = 55(1 g
+ C/2).
Each snubber point should be of,tedassoonasthe
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snubber is tested.
If the point plo falls on or below the
" Accept" line, testing of that type o snubber may be terminated. j N
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SOUTH TEXAS - UNITS 1 & 2 3/4 7-23 l14 t-AAA M..
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SURVEILLANCE UIREMENTS (Continued)
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unctional Tests (Contin d)
If the point p1 ted falls above the " cept" line, testing must continue ntil the point falls i the " Accept" region or all the snu ers of that type have en tested.
l Testing equi ent failure during fun ional testing may inval date l
that day s esting and allow that y's testing to resume ew at a I
later ti provided all snubbers ested with the failed ipment during e day of equipment fai re are retested. The epresentative samp selected for the funct nal test sample plans all be randomly j
se cted from the snubbers each ty t
testing. The review s 11 ensure,pe and reviewe before beginning as far as p cticable, that hey are representative f the various configur ions, operating environments, range of size, and capacity of s ubbers of each type.
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Snubbers placed in t same location as snuptfers which failed the
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previous functiona test shall be retested /at the time of the next L
functional test t shall not be included'in the sample plan.
If l
during the fun ional testing, additi fl sampling is required due to failure of o y one type of snubber e functional test results shall be re ewed at that time to termine if additional samples should be imited to the type o ubber which has failed the
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functio 1 testing.
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Func onal Test Acceptance iteria l
T e snubber functional est shall verify that:
1)
Activation (
raining action) is achieved wi n the specified j
range in bot tension and compression; eed,orreleaseratewhererequdd,ispresentinboth 2)
Snubber tensio and compression, within the spe fied range; l
3)
Whe required, the force required initiate or maintain motion o the snubber is within the spec led range in both directions f travel; and irednottodisplaceundercohtd-f 4
For snubbers specifically r l
uous load, the ability of )
snubber to withstand load it out displacement.
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Testingmethodsmaybeused'tomeasureparametersindirec(1 or parameters other than those specified if those results'can be correlated to the sp/eci'fied parameters through established methods.
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l LANT SYSTEMS XQ WA)
SURVEILL E REOUIREMENTS (Continued)~ ~7
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Functional Test Failure Ana1W is f
An engineering evaluati hall be made of each failure to a the functional test accep nce criteria to determine the cause the failure. The resul of this evaluation shall be used, applicable, in selecting snub rs to be tested in an effort to dete ine the OPERABILITY of her snubbers irrespective of type h may be subject to t same failure mode.
For the ubbers found inoperable, an engineeri evaluation shall be per reed on the components to which the i perable snubbers are atta ed. The' purpose of this en ineerin aluation shall be to I
de reine if the components to wh ch the perable snubbers are
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.tached were adversely affected by the noperability of the snubbers in order to ensure that the componen mains capable of meeting the designed service.
If any snubber selected for fu lonal testing either fails to lock up or fails to move, i.., frozen in place, the cause will be evaluated and, if caused b. manufacturer or design deficiency, all snubbers of the same typ subject to the same defect shall be func-tionally tested. This esting requirement shall be inde endent of the requirements st d in Specification 4.7.9e. for snu bers no i
meeting the functi al test ; acceptance criteria.
FunctionalTest[ngofRepairedandReplacedSnubbers h.
l Snubbers wh[ch fail the visual inspection or the functjo[a1 test acceptagc6 criteria shall be repaired or replaced. Jteplacement
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snubbeys and snubbers which have repairs which mi ht affect the func)ional test results shall be tested to meetA e functional test criteria before installation in the unit. MecKanical snubbers shall ha've met the acceptance criteria subsequent o their most recent
/ service, and the freedom-of-motion test t have been performed
/ within 12 months before being installe n the unit.
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Snubber Service Life Program
, r' The service life of hydraulic a d mechanical snubbers shall be monitored to ensure that the Jiervice life is not exceeded between surveillance inspections. The maximum expected service life for various seals, springs, apd other critical parts shall be deter-mined and established based on engineering information and sh be
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extended or rhortened sed on monitored test results and f ure i
history.
Critical p ts shall be replaced so that the a um
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service life will,not be exceeded during a period when e snubber 2
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is required to he' OPERABLE. The parts replacements s (11 be docu-mented and the/ documentation shall be retained in ordance with Specificatigr(6.10.3.
SOUTH TEXAS - UNITS 1 & 2 3/4 7-25 y 1, 4w 4
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10 20 30' 40 50 60 70 80 90 100 N
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FIGURE 4.7
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PLA!! 2) FOR SN BER FUNCTIONAL. TEST SOUTH TEXA'S - UNITS 1 & 2 3/4 7-26 M i ' AO No,
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PLANT SYSTEMS BASES 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 its design basis temperature and is consistent with the recommend-l ations of Regulatory Guide 1.27, " Ultimate Heat Sink for Nuclear Plants,"
March 1974.
l 3/4.7.6 (Not used) l l
3/4.7.7 CONTROL ROOM MAKEUP AND CLEANUP FILTRATION SYSTEM The OPERABILITY of the Control Room Makeup and Cleanup Filtration System ensures that: (1) the ambient air temperature.does not exceed the allowable l
temperature for continuous-duty rating for the equipment and instrumentation l
cooled by this system, and (2) the control room wi11' remain habitable for operations personnel during and following all credible accident conditions.
Operation of the system with the heaters operating for at least 10 continuous l
I hours in a 31-day period is sufficient to reduce the buildup of moisture on the adsorbers and HEPA filters. The OPERABILITY of this system in conjunction with control room design provisions is based on limiting the radiation exposure to l
personnel occupying the control room to 5 rems or less whole body, or its i
equivalent. This limitation is consistent with the requirements of General l
Design Criterion 19 of Appendix A, 10 CFR Part 50. ANSI H510-1980 will be used as a procedural guide for surveillance testing.
3/4.7.8 FUEL HANDLING BUILDING EXHAUST AIR SYSTEM l
The OPERABILITY of the Fuel Handling Building Exhaust Air System ensures i
that radioactive materials leaking from the ECCS equipment within the FHB fol-(
lowing a LOCA are filtered prior to reaching the environment. Operation of l
the system with the heaters operating for at least 10 continuous hours in a 31-day period is sufficient to reduce the buildup of moisture on the adsorbers and HEPA filters. The operation of this system and the resultant effect on offsite dosage calculations was assumed in the safety analyses. ANSI N510-1980 will be used as a procedural guide for surveillance testing.
3/4.7.9 M A4 uv.Q All snubbers ar equired OPERABLE to ensure tha he structural integrity of the Reactor Coo nt System and all other safety-r ated systems is main-tained during a following a seismic or other ev initiating dynamic loads.
Snubbe are classified and grouped by d ign and manufacturer but not by size. Fo example, mechanical snubbers uti zingthesamedesignfeaturesof the 2 ',10-kip and 100-kip capacity ma factured by Company 'A" are of the The same desige mechanical r ubbers manufactured by Company "B" same ype.
fo the purposes of this Technical Sp Hfication would be of a different typ /,
would hydraulic snubbers from eit er manufacturer.
A list of individual snJbbe with detailed information of snubb location ize and of system affecte shall be available at the plant in cordance i
i SOUTH TEXAS - UNITS 1 & 2 B 3/4 7-4 Unit 1 - Amendment No.
Unit 2 - Amendment No.
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N U ew1 ptANT SYSTEMS ay
- BASES bHUBBERS(Continued) with Section 50.71 c) 10 CFR Part 50. The access of each snubber shall be determine d approved by the Plant Oper Lons Review Committee. The determination sha be based upon the existing r ation levels and the i
expected time t perform a visual inspection i ach snubber location as well as other fact s associated with accessibilit during plant operations e.g.,
temperatur atmosphere, location, etc., a the recommendations of Re ulator i
Guides 8 and 8.10. The addition or d 1 ion of any hydraulic or mech nica J
snubber shall be made in accordance wit Section 50.59 of 10 CFR Part 50.
i The visual inspection frequency s based upon maintaining a const t level snubber protection to safety-re ted systems during an earthquake r severe ransient. Therefore, the requi d inspection interval varies iny sely with the observed snubber failures a d is determined by the number of noperable snubbers found during the pr ous inspection, the total popul ion or category size, and the previous insp tion interval.
a Snubbers may be ca gorized,basedupontheiraccess)ility'duringpower operation, as accessi e or inaccessible. These catego 'es may be examined j
separately or join However, that decision must be ade and documented
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l before any ins)ec on, and -that decision shall be use as the basis upon which to determine tie ext inspection interval for that 'ategory.
Inspections performed bef (e that interval has elapsed may b sed as a new reference point to determin he next inspection. However, thepesults of such early inspection performed before the original re utred time interval has elapsef (nomina)l.' time less 25%) may not be used to 16gthen the required inspectipri i
intervi Any inspection whose results req re a shorter inspection in erval wil,1 override the previous schedule.
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The acceptance criteria are to
'used it) the visual inspect n to determine OPERABILITY of the snubb For cample, if a flui rt of a hydraulic snubber is found to be y covered, the snubber shal declared i
unacceptable and may be re-cla ified as acceptable for de ining the next f
l inspection interval rovided t:
I an analysis for hydraulic fluid of that particular snub er had)ffected snubber is functhat the fluid s i 1 meets its required dicate specifications; and (2) t e a nally tested in the as-found condition and de ined OPERABLE per Specifi tion 4.7.9f.
I To provide ass ance of snubber functional eliability, one of thre 1
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functional testin thods is used with the s) ted acceptance criteria-1.
Fun ionally test 10% of a type snubber with an addit nal 10%
ted for each functional te ng failure, or 2
Functionally test a sample ize and determine sampig acceptance or rejection using Figure 447-1, or
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l SOUTH TEXAS - UNITS 1 & 2 B 3/4 7-5 Unit 1 - Amendment No. W Unit 2 - Amendment No. 7, l
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l PLANT SYSTEMS l
BASES M ERS (Continued) p l
3.
Functionall test a representative sample size an determine sample l
acceptanc or rejection using the stated equati Figure 4, was developed using "Wald's Sequent Probability Ratio Plan" as des bed in " Quality Control and Industri Statistics" by Acheson J.
Duncan.
P anent or other exem>tions from the s veillance program for individual snub rs may be granted by tie Commission V a justifiable basis for exemption t is resented and, if applicable, snubber
'e destructive testing was performed i
l qualify the snubbers for the applica e design conditions at either the completion of their fabrication or at subsequent date. Snubbers so exempted I
shall be listed in the list of indi dual snubbers indicating the extent of th exemptions.
l The service life of a sn ber is established via manufacturer input nd information through conside tion of the snubber service conditions an associated installation maintenance records ers, seal replaced, spring repl d in high radiation area (newly installed snu
, in high temperar re area, etc.). The require to monitor the snubber service life is i d uded to l
ensure that the sn ers periodically undergo a performance ev ation in view l
/ of their age and perating conditions. These records will pr ide statistical L bases for futu consideration of snubber service life.
3/4.7.10 SEALED SOURCE CONTAMINATIO'N The limitations on removable contamination for sources requiring leak testing, including alpha emitters, is based on 10 CFR 70.39(a)(3) limits for plutonium. This limitation will ensure that leakage from Byproduct, Source, and Special Nuclear Material sources will not exceed allowable intake values.
Sealed sources are classified into three grou)s according to their use, with Surveillance Requirements commensurate with tie probability of damage to a source in that group. Those sources which are frequently handled are required to be tested more often than those which are not. Sealed sources which are l
continuously enclosed within a shielded mechanism (i.e., sealed sources within radiation monitoring or boron measuring devic'es) are considered to be stored l
and need not be tested unless they are removed from the shielded mechanism.
3/4.7.11 (Not used) 3/4.7.12 (Not used) l SOUTH TEXAS - UNITS 1 & 2 B 3/4 7-6 Unit 1 - Amendment No. If Unit 2 - Amendment No. 9 i
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i ST-NOC-AE-000262 Page1 l
New Technical Requirements Manual Pages l
l New Technical Requirements Manual Pages Enclosed 3/4.7-1 3/4.7-2 3/4.7-3 3/4.7-4 3/4.7-5 3/4.7-6 3/4.7-7 3/4.7-8 B 3/4.7-1 B 3/4.7-2 1
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PLANT SYSTEMS NOTE THIS TRM REQUIREMENT DUPLICATES THE REQUIREMENTS OF TECHNICAL SPECIFICATION 3/4.7.9 SNUBBERS 3/4.7.9. THE REQUIREMENTS AND ACT!ONS OFTHE TECHNICAL SPECIFICATIONS GOVERN UNTIL THE NRC APPROVES THE RELOCATION AS REQUESTED IN NOC-AE-000262.
LIMITING CONDITION FOR OPERATION 3.7.9 All snubbers shall be OPERABLE. The only snubbers excluded from the requirements are tnose installed on nonsafety-related systems and then only if their failure or failure of the system on widch they are installed would have no adverse effect on c.ny safety-related system.
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 on any system, 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 4.7.9g. on the attached component or declare the attached system inoperable and follow the appropriate ACTION for that r.ystem.
SURVEILLANCE REQUIREMENTS 4.7.9 Each snubber shall be demonstrated OPERABLE by performance of the following augmented inservice inspection program in lieu of the requirements of Specification 4.0.5.
a.
Insoection Tvoes As used in this specification, type of snubber shall mean snubbers of the same design and manufacturer, irrespective of capacity.
b.
VisualInspections Snubbers are categorized as inaccessible or accessible during reactor operation. Each of these categories (Inaccessible and Accessible) may be inspected independently or jointly according to the schedule determined by Table 4.7-2. The visualinspection interval for each population or category of sr.ubber shall be deterrnined based upon the criteria provided in Table 4.7-2 and the first inspection interval determined using this criteria shall be based upon the previous inspection interval as established by the requirements in effect before amendment nos. 44 and 33.
South Texas - Units 1 & 2 3/4.7-1 TRM Amendment 10
PLANT SYSTEMS l
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TABB 4.7-2 L
SNUBBER VISUALINSPECTIONINTERVAL NUMBER OF UNACCEPTABLE SNUBBERS Population or Column A Column B Column C 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 me 400 8
18 36 500 12 24 48 750 20 40 78 1000 or greater 29 56 109 Note 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 interval. Snubbers may be categorized, based upoc
- heir accessibility during power operation, as accessible or inaccessible. These catepries may be examined separately or jointly. 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.
Note 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 integer includes a fractional value of unacceptable snubbers as determined by interpolation.
Note 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 but not greater than 48 months.
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l South Texas - Units 1 & 2 3/4.7-2 TRM Amendment 10
I PLANT SYSTEMS l
Table 4.7-2 (Continued)
SNUBBER VISUAL INSPECTION INTERVAL Note 4: If the number of unacceptable snubbers is equal to or less than the number in Column B l
but greater than the number in Column A, the next inspection interval shall be the same as the previous interval.
Note 5: If the number of unacceptable snubbers is equal to or greater than the number in Column C, the next inspection interval shall be two-thirds of the previous interval. However, if the number of unacceptable snubber'
- ss than the number in Column C but greater than the number in Column B, the L
-aterval shall be reduced proportionally by interpolation, that is, the previous interval shall be reduced by a factor that is one-third i
of the ratio 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.
Note 6: The provisions of Specification 4.0.2 are applicable for all inspection intervals up to and including 48 months.
l South Texas - Units 1 & 2 3/4.7-3 TRM Amendment 10 l
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I PLANT SYSTEMS SURVEILLANCE REQUIREMENTS (Centinued) c.
VisualInsoection Acceptance Criteria Visual inspections shall verify that: (1) the snubber has no visible indications of damage or impaired OPERABILITY, (2) attachments to the foundation or supporting structure are functional, and (3) fasteners for attachment of the snubber to the component and to the snubber anchorage are functional. Snubbers which appear inoperable as a result of visualinspections shall be classified as unacceptable and may be reclassified acceptable for l
the purpose of establishing the next visual inspection interval, provided that: (i) the cause i
of the rejection is clearly established and remedied for that particular snubber and for other snubbers irrespective of the type that may be generically susceptible; and (ii) the affected snubber is functionally tested in the as-found condition and determined OPERABLE per Specification 4.7.9f. 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 criteria (i) and (ii) above are met. A review and evaluation shall be performed and documented to justify continued operation with an unacceptable snubber. If continued operation cannot be justified, the snubber shall be declared inoppable and the ACTION requirements shall be met.
- d.
Transient Event Inspection An inspection shall be performed of all snubbers attached to sections of systems that have experienced unexpected, potentially damaging transients as determined from a review of operational data and a visualinspection of the systems within 6 months following such an event. In addition to satisfying the visualinspection acceptance criteria, freedom-of-motion of mechanical snubbers shall be verified using at least one of the following: (1) manually induced snubber movement; or (2) evaluation ofin-place snubber piston setting; or (3) stroking the mechanical snubber through its full range of travel.
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South Texas - Units 1 & 2 3/4.7-4 TRM Amendment 10 i
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PLANT SYSTEMS
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, SURVEILLANCE REQUIREMENTS (Continued) i e.
Functional Tests During the first refueling shutdown and at least once per 18 months thereafter during etdown, a representative sample of snubbers of each type shall be tested using one of tne fo'Jowing sample plans. The sample plan for each type shall be selected prior to the test period and cannot be changed during the test period. The NRC Regional Administrator shall be notified in writing of the sample plan :clected for each snubber type l
prior to the test period or the sample plan used in the prior test period shall be implemented:
- 1) At least 10% of the total of each type of snubber shall be fur.ctionally tested either in-place or in a bench test. For each snubber of a type that does not meet the functional test acceptar ce criteria of Specification 4.7.9f., an additional 10% of that type of snubber shall be functionally tested until 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 number of snubbers of a type found not meeting the acceptance requirements of Specification 4.7.9f. 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 the " Reject" region, all snubbers of that type shall be functionally tested. If at any time the coint plotted falls in the " Accept" region, testing of snubbers of that we may be terminated. When the point plotted lies in the " Continue Testing" region, additional snubbers of that type shall be tested until the point falls in the " Accept" region or the " Reject" region, or all the snubbers of that type have been tested; or
- 3) An initial representative sanple of 55 snubbers shall be functionally tested. For each snubber type which does not meet the functional test acceptance criteria, another sample of at least one-half the size of the initial sample shall be tested until the total number tested is equal to the initial sample size multiplied by the factor,1 + C/2, where "C" is the number of snubbers found which do not meet the functional test acceptance criteria. The results from this sample plan shall be plotted using an
" Accept" line which follows the equation N = 55(1 + C/2). Each snubber point should be plotted as soon as the snubber is tested. If the point plotted falls on or below the
" Accept" line, testing of that type of snubber may be terminated.
If the point plotted falls above the " Accept" Ta, testing must continue until the point falls in the " Accept" region or all the snubbers of that type have been tested.
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South Texas - Units 1 & 2 3/4.7-5 TRM Amendment 10
PLANT SYSTFJdS SURVEILLANCE REQUIREMENTS (Continued) e.
Functional Tests (Continued)
Testing equipment failure during functional testing may invalidate that day's testing and l
allow that day's testing to resume anew at a later time provided all snubbers tested with the failed equipment during the day of equipment failure are retested. The representative sample selected for the functional test sample plans shall be randomly selected from the snubbers of each type and reviewed before beginning the testing. The review shall ensure, as far as practicable, that they are representative of the various configurations, operating environments, range of size, and capacity of snubbers of each type. Snubbers placed in the l
same place location as snubbers which failed the previous functional test shall be retested at the time of the next functional test but shall not be included in the sample plan. If during the functional testing, additional sampling is required due to failure of only one type of snubber, the functional test results shall be reviewed at that time to determine if additional samples should be limited to the type of snubber which has failed the functional testing.
f.
FunctionalTest Acceotance Criteria The snubber functional test shall verify that:
- 1) Activation (restraining action) is achieved within the specified range in both tension and l
compression; l
- 2) Snubber bleed, or release rate where required, is present in both tension and compression.
l 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 directions of travel; and j
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- 4) For snubbers specifically required not to displace under continuous load, the ability of the snubber to withstand load without displacement.
Testing methods may be used to measure parameters indirectly or parameters other than those specified if those results can be correlated to the specified parameters through established methods.
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South Texas - Units 1 & 2 3/4.7-6 TRM
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Amendment 10
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PL. ANT SYSTEMS SURVEILLANCE REQUIREMENTS (Continued) l l
g.
FunctionalTest Failure Analysis An engineering evaluation shall be made of each failure to meet the functional test acceptance criteria to determine the cause of the failure. The results of this evaluation shall be used, if applicable, in selecting snubbers to be tested in an effort to determine the OPERABILITY of other snubbers irrespective of type which may be subject to the same failure mode.
For the snubbers found inoperable, an engineering evaluation shall be performed on the components to which the inoperable snubbers are attached. The purpose of this engineering evaluation shall be to determine if the components to which the inoperable snubbers are attached were adversely affec*ed by the inoperability of the snubbers in order to ensure that the component remains capable of meeting the designed service.
If any snubber selected for functional testing either fails to lock up or fails to move, i.e.,
frozen in place, the cause will be evaluated and, if caused by manufacturer or design deficiency, all snubbers of the same type subject to the same defect shall be functionally tested. This testing requirement shall be independent of the requirements stated in
)
Specification 4.7.9e. for snubbers not meeting the functional test acceptance criteria.
h.
Functional Testing of Repaired and Replaced Snubbers Snubbers which fail the visualinspection or the functional test acceptance criteria shall be repaired or replaced. Replacement snubbers and snubbers which have repairs which might affect the functional test results shall be tested to meet the functional test criteria before installation in the unit. Mechanical snubbers shall have met the acceptance criteria i
subsequent to their most recent service, and the freedom-of-motion test must have been performed within 12 months before being installed in the unit.
i.
Snubber Service Life Prngram The service life of hydraulic and mechanical snubbers shall be monitored to ensure that the service life is not exceeded between surveillance inspections. The maximum expected service life for various seals, springs, and other critical parts shall be determined and established based on engineering information and shall be extended or shortened based on monitored test results and failure history. Critical parts shall be replaced so that the maximum service life will not be exceeded during a period when the snubber is required to be OPERABLE. The parts replacements shall be documented and ih-documentation shall be retained in accordance with Specification 6.10.3.
L South Te-xas - Units 1 & 2 3/4.7-7 TRM Amendment 10
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PLANT SYSTEMS SURVEILLANCE REQUIREMENTS (Continued) 10 9
8 7
/
7 6
REJECT r
C
,p s 3
c.@
4 COR71NUE l
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TESTING y
3 7
y
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2 p
G*,p ACCEPT 1
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0 10 20 30 40 50 60 70 80 90 100 cone 22s4 N
FIGURE 4.7-1 SAMPLE PLAN 2) FOR SNUBBER FUNCTIONAL TEST South Texas - Units 1 & 2 3/4.7-8 TRM Amendment 10
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PLANT SYSTEMS BASES i
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' 3/4.7.9 SNUBBERS l
All snubbers are required OPERABLE to ensure that the structural integrity of the Reactor Coolant System and all other safety-related systems is maintained during and following a seismic or other event initiating dynamic loads.
I Snubbers are classified and grouped by design and manufacturer but not by size. For example, mechanical snubbers utilizing the same design featutes of the 2-kip,10-kip and 100-kip capacity manufactured by Company "A" are of the same type. The same design mechanical snubbers manufactured by Company "B" for the purposes of this Technical Specification would be of a different type, as would hydraulic snubbers from either manufacturer.
1 A list ofindividual snubbers with detailed information of snubber location and size and of system affected shall be available at the plant in accordance with Section 50.71(c) of 10 CFR Part 50. The accessibility of each snubber shall be determined and approved by the Plant Operations Review Committee. The determination shall be based upon the existing radiation levels and the expected time to perform a visual inspection in each snubber location as well as other factors associated with accessibility during plant operations (e.g., temperature, atmosphere, location, etc.), and the recommendations of Regulatory Guides 8.8 and 8.10. Tne addition or deletion of any hydraulic or mechanical snubber shall be made in accordance with Section 50.59 of 10 CFR Part 50.
The visual inspection frequency is based upon maintaining a constant level of snubber protection to safety-related systems during an earthquake or severe transient. Therefore, the required inspection interval varies inversely with the observed snubber failures and is determined by the number ofinoperable snubbers found during the previous inspection, the total population or category size, and the previous inspection interval.
Snubbers may be categorized, based upon their accessibility'during power operation, as accessible or inaccessible. These categories may be examined separately orjointly. However, that decision must be made and documented before any inspection, and that decision shall be used as the basis upon which u
to determine the next inspection interval for that category. Inspections performed before that interval has elapsed may be used as a new reference point to determine the next inspection. However, the results L of such early inspections performed before the original required time interval has elapsed (nominal time less 25%) may not be used to lengthen the required inspection interval. Any inspection whose results require a shorter inspection interval will override the previous schedule.
The acceptance criteria are to be used in the visualinspection to determine OPERABILITY of the snubbers. For example,if a fluid port of a hydraulic snubber is found to be uncovered, the snubber shall be declared unacceptable and may be re-classified as acceptable for determining the next inspection interval provided that: (1) an analysis for the hydraulic fluid of that particular snubber had l
indicated that the fluid still meets its required specifications; and (2) the affected snubber is functionally tested in the as-found condition and determined OPERABLE per Specification 4.7.9f.
South Texas - Units 1 & 2 B 3/4.7-1 TRM L
Amendment 10 i
PLANT SYSTEMS BASES 1
To provide assurance of snubber functional reliability, one of three functional testing methods is used with the stated acceptance criteria-l.
Functionally test 10% of a type of snubber with an additional 10% tested for each functionaltesting failure, or j
r 2.
Functionally test a sample size and determine sample acceptance or rejection using Figure 4.7-1, or 3.
Functionally test a representative sample size and determine sample acceptance or l'
rejection using the stated equation.
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Figure 4.7-1 was developed using "Wald's Sequential Probability Ratio PLn" as described in
" Quality Control and Industrial Statistics" by Acheson J. Duncan.
l 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 snubbers for the applicable design conditions at either the completion of their fabrication or at a subsequent date. Snubbers so exempted shall be listed in the list ofindividual snubbers indicating the extent of the exemptions.
The service life of a snubber is established via manufacturer input and information through consideration of the snubber service conditions and associated installation and maintenance records (newly installed snubbers, seal replaced, spring replaced, in high radiation area, in high temperature area, etc.). The requirement to monitor the snubber service life is included to ensure that the snubbers periodically undergo a performance evaluation in view of their age and operating conditions. These records will provide statistical bases for future consideration of snubber service life.
3/4.7.13 AREA TEMPERATURE MONITORING i
The area temperature limitations ensure that safety-related equipment will rot be subjected to l-temperatures in' excess of their environmental qualification temperatures. Exposure to excessive temperatun:s may degrade equipment and can cause a loss ofits OPERABILITY. The temperature limits include an allowance for instrument error ofi 3 F maximum.
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South Texas - Units 1 & 2 B 3/4.7-2 TRM Amendment 10 T'-
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