ML20076B137
| ML20076B137 | |
| Person / Time | |
|---|---|
| Site: | North Anna  |
| Issue date: | 05/17/1979 |
| From: | Stallings C VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.) |
| To: | Harold Denton, Parr O Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 7905230536 | |
| Download: ML20076B137 (23) | |
Text
. _ _. _ _
May 17, 1973 Hr. Harold R. Denton, Director Serial No. 349 Office of Nuclear Reactor Regulation LQA/ESG:esh Attn: Mr. O. D. Parr, Chief Light Vater Reactors Branch No. 3 Docket Nos. 50-338 Division of Project Management 50-339 U. S. Nuclear Regulatory Comission Washington, DC 20555 License No. NPF-4
Dear Mr. Denton:
AMENDMENT TO OPERATING LICENSE SUPPLEMENT TO PROPOSED TECHNICAL SPECIFICATION O
CHANGE NO. 12 NORTH ANNA POWER STATION UNIT NO. I By our letter, Serial No. 329, dated June 13, 1970' we requested an amendment to Operating License No. HPF-4 for the North Anna Power Station, Unit No. I.
This proposed amendment revised Technical Specification 3/4.7.12
" Settlement of Class 1 Structures," to' increase the amount of allowable settle-nent for the Service Water Pump House. Later, by letter dated November 22, 1978, (Serial No. 646), and during a meeting with the Staff on December 5,1973, we indicated that we were experiencing difficulties in completing the surveillance requirements of other portions of TS 3/4.7.12, as a result of typographical errors i
and incorrect settlement base dates in the specification. During the December 5 meetlng, we stated we were conducting an extensive review of the entire settle-ment nonitoring program. Based on this review, we are proposing the attached revisions to TS 3/4.7.12.
O A general discussion of the proposed changes is included in Attachment 1. consists of a " marked-up" copy of the present Unit 1 specification, with each proposed change Indicated and explained. The revised version of the specification is provided in Attachment 3.
The revisions to the settlement monitoring program should also be reflected in the operating IIcense for Unit No. 2 when It is issued. The proposed specification for Unit 2 is included as Attachment 4.
It will be noted that these proposed specifications include the limits on settlement of the Service Water Pump House which were established by the Staff in its January 9,1979 transmittal to the Atomic Safety and Licensing Apocal Board.
These linits are included in this submittal for the purposes of consistency. We understand that it is the Staff's position that the limits on the settlement of the Service Water Pamp House will not be changed without direction from the Appeal Board. We believe, however, that the other changes in this subnittal should be i
approved no later than the time of issuance of an operating 1.lconse for Unit 2.
A copy of these proposed changes will be provided to the Appeal Board by separate correspondence.
7905230 6 M S ![
[
.e Mr. Harold R. Denton 2
The proposed changes for Unit I have been reviewed and approved by the Station and System Nuclear Safety and Operating Consalttees.
It has been determined that these changes do not involve an unreviewed safety question, as defined in 10 CFR 50 59.
Very truly yours, i
b.
, h AlbE2}W C. M. Stallings Vice President-Power Supply and Production Operations Attachments cca Mr. James P. O'Reilly, Director Office of Inspection end Enforcement Region 11 1
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1 COMMONWEALTH OF VIRGINIA
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S. S.
CITY OF RICHMOND
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Before me, a Notary Public, in and for the City and Common-wealth aforesaid, today personally appeared C. M. Stallings, who being duly sworn, made oath and said (1) that he is Vice President-Power 3
Supply and Production Operations, of the Virginia Electric and Power Company, (2) that he is duly authorized to execute and file the fore-going Amendment in behalf of that Company, and (3) that the statements in the Amendment are true to the best of his knowledge and belief.
Given under my hand and notarial seal this gday of 4
N/t V
, M.
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My Commission expires damary 2 4 1941
+f W 8,Y M
Nota'ry Public~~ ~
l (SEAL)
ATTACHMENT 1 REQUEST TO CHANGE TECHNICAL SPECIFICATION T.S. 3/4.7.12 - SETTLEMENT OF CLASS 1 STRUCfURES NORTH ANNA UNIT 1 Background Information By letter, Serial No. 646, dated November 22, 1978, the NRC Staff was informed of difficulties Vepco had experienced in. completing the surveillance requirements of Technical Specifications 3/4.7.12 due to:
1.
Inconsistencies between the surveillance requ'irements and the bases for the requirements.
2.
Deficiencies in the survey monitoring. program.
3.
Typographical errors in T.S. Table 3.7-5.
(}
The referenced letter stated that a review of the settlement monitoring program was being performed.
The proposed changes to the T.S. are a result of that review.
Explanation of Proposed Changes Included in Attachment.2 in a mark,cd-up copy of the existing T.S. showing proposed changes. A sheet of " Explanatory Notes" is also included to aid in understanding the need for the-requested changes.
In general, the proposed changes a're the results of our review of the settlement monitoring program in which the problems experienced in c6mpleting the surveillance requirements of T.S. 3/4.7.12 have been addressed as follows:
The first survey was condudted in May 1975 to establish a base value 1.
({])
for all survey points. Previously, T.S. Table 3.' 7-5 specified bases other than the !!as,1976 basis in some cascs and did not specify base value dates for.survei points established after May 1975.
Corrections have been made referencing bases to the May 1976 basis. _ Points estab-lished after the May 1976 survey are referenced to the date the first survey was taken on the established point.
The allevable settlement values of points 114 (Column E-17 of Service Building),158 (Column
~
D-95 of Turbine Building), and 245 and 246 (Fuel Oil Pump House) have been corrected to include settlement affecting limiting iters that occurred prior ~ to May 1976.
Other base survey references are explained in the " Explanatory Notes" attacheil'to the marked-up copy of the T.S.
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2.
Deficiencies in the survey monitoring program as referenced in our letter (Serial No. 646) basically referred to destroyed and reset 4
survey points resulting from construction activities.
Statements have been added to the proposed T.S. Bases that specifically address what action or evaluation is to be performed to ensure continuity in the data for points that may be inaccessible or damaged.
In addition, the review of the settlement monitoring program will probably result in protection of settlement monitoring points to preclude, if possible, damage to points.
)
3.
Corrections to typographical errors in T.S. Table 3.7-5 have been made and are indicated inthe " Explanatory Notes" to the marked-up copy of the T.S.
i The changes are proposed in an effort to clarify the discrepancies in the T.S.
which have presented difficulties in completing the surveillance requirements
()
of the T.S.
The proposed changes do not involve any safety implications. As stated in our letter (Serial No. 646) to the NRC, the existing data which have been collected, verify that there has been no occurrence of significant settle-ment of the points in question.
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ATTACHMEllT 2 11-26-77 M A Rx.ic b - O P c ra G i 5 PEcl Ft C Are o,J PLAtlT SYSTEMS 3/4.7.12 SETTLEME?iT OF CLASS 1 STRUCTURES LIM:
'*!G C0tl0ITIO!! FOR OPEPATIC:1 1
3.7.12.1 The-total settlenent of each Class / structure or the differential 0) settlement between Class @ structures shall not exceed the allowable q
values of Table 3.7-5.
1 APPLICABILITY: All MODES ACTIOil:
With either the total settlenent of any structure or/pe,-cc.A the dif-a.
p ferential settlement of any structures exceeding 70 of the 01 conduct an engineering review of 0)
V allowable settlement 6ffG1!r2 field conditions and evaluate the consequences of additional settlement. Sutmit a special report to the Cc= mission pur-suant to Specification 6.9.2 within 60 days, containing the results of the investigation, the evaluation of existing and possible continued settlenent and the remedial action to be taken if any, ' including the date of the next survey.
b.
With the total settlement of any structs.re or the differential settlement of any two structures exceeding the allowable settlement value of Table 3.7-5, be in at least HOT STANDSY within 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and COLD SHUTD0!!N within the following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />.
Q SURVEILLAtlCE REOUIREMENTS L
.L 4.7.12.1 The total' settlement of eac'h Class (D structure or the dif-CO ferential settlement between Class Q structures listed in Table 3.7-5 O) shall be detennined to the nearest 0.01 foot by measurement and calcula-tion at least once per 6 months.
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TAatE 3.7-5 h
A110WA!!!E total SETTLIM[NT OR DifffRfNTI AL SETilfMENT FOR Ct A551 STROClunES ALL0t1AULE AlicuAULE f,
5[lILEHfHT
- Ulffilifull Al*~
l'1 TOTAL Sflit t HEnt SLTTLEMENT
,_ POINT STRUCTtE PolNT SIRUCit:nr /cor4PoNENT jffTl Jfy]_
t i) 2*
SLTTLDi[NT b
130 Containment Unit 1 223 fuel Buildin9 H/A DM o. 2.
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(4) l'O Containment Unit 1 129 Auxillary Building N/A J1.44-O. s 2.
~
J 143 Containment thalt 1 142 Unit 15afeguards Area fl/A 0.04 144 Contaltunent Unit 1 145 Unit 1 SafcDuards Area it/A 0.04 149 Contalnnent Unit 1 239 Unit i Hain Steam Valve llouse H/A Ortf o. ~t LM) 144 Containment unit i 243,199,132 Servire Building N/A cap o. s 2.
N) 146 Safeguards Unit i 239 unit 1 Main Steam Valve liouse N/A O.ti)[
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123 Auxillary Building 233 Uillt i Hain Steam valve llouse N/A 0.03 129 Auxillary Dullding 239 Unit i Hain Steam Valve House H/A 0. 011 129 Ausillary Building 223 fuel Building il/A 0.05 123 Auxillary Building 224 fuel !!allding N/A 0.05 122 Auxiliary Dullding 119 Service building Tunnel N/A 0.01
.7,ac Service Wtor Pune llouse 15,16.
Service h ter Piping 9 Sul1 6I O) 6.-tT" o M No~ 'l71
'll 17.'18 Hnrth Side of expansion joint H/A 243.132 Service Dullding (E-5, I-6) 238 Unit i Hain hicam Valve llouse N/A
.o.,4s o,04 (6)
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frca Qgg; p
- ervico Building (I-14) 113 thalt 2 Main Steam V.tivo linuse N/A I
117 S
ab liause - unit i 24h Pipe Tunnel H/A 0,lyf (y) y 272 Auxillary feedwater Pimp 1
11-26-77 PLAtti SYSTEMS 3ASES 3/4.7.11 SEALED SOURCE CGNTAMUlATION CThe limitations on sealed source removable contamination ensure that\\tte total body or individual organ irradiation does not exc.eed.
allowa'J1e limits in the event of ingestion or inhalation of the source material. The limitations on removable contamination for sources re-quiring leak testing, including alpha emitters, is based on 10 CFR 70.39(c) limits for plutcnium. Leakage of sources excluded from the requirements of this specification represent less than one maximum permissible body burden for total body irradiation if the source ma-terial is inhaled or ingested.
g) 3 /a.7.12 SETTLEMENT OF CLASS 1 STRUCTURES P
N In order to assure that settlement does not exceedt$redicted arB allowable settlement values, a program has been establisheo to conduct a survey of a specified number of points at the site on an semisann (w) basis.
O.lue for ali the poin# Additional surveys will be performed semi-annually. The determination of the elevation of the points shall be by precise leveling with second order Class 2. accuracy as defined by the U.S. Decartment of Commerce, National Oceanic and Atmoscheric Administra-N.e *)
tion, dational Ocean surveyq 'r tne togal settlement or cirferential settlement exceeds 75@ of the % oFa$l'e value, the frequency of surveil-c.)
lance shall be incr.edsed as dictated by the engineering review.
p,a s
Allowable differential movement is controlled by pipe deflections (v7 permitted by fixation points in buildings. The items limiting differen-tial settlement are as follows:
Reference Monitorinc points Limitino Item Containment Unit i Fuel Building Fuel Transfer Tube
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Reference Monitorinc Foints Li :itine Itera Ccntaf-ent Unit 1 Unit 1 Main yteam Val.- 9euse 6"-51-16
. 9 (t) 32"-5:-$2 *
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Co..: ircea: Uni: l o;si service Seilding (3-line) E-3 Safeguardsf nit i Unit l'Hain Steam anye Hcuse S"-GIfI if
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'uxiliary Building Unit 1 i*ain 57ean Valve House 8"-MS -113 g3 Aur.iiiary Building 6'6 Fuel Suilding 4" :.?-23 Auxiliarv Buildine ('
service Suilding Tunnel 24"-US-102 J.
G rvice '.'9.ta-32 3 M:se 5e**=R:er Ploin; O_ SWPM
_ecansj cdote d Cl) fervice E lcing (E-5))
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{t, tQ Unit 1 Main Steam Vaive House S-151-Q3 Service Suilding (E-14 Unit 2 Main Steam Valve House 24"-W5-42
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Pecp House s U1it 1 Pipe Tunnel, 3"-UAPD-9-501 -Q 3 Aux: a tary Feedc.: ster' (M
P" o House - Uait 2
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8eitet=s ei e Te==e1 2"-Cc-s0-151-03 er.
P C3"-CC-332-i s t -0 3T-hN
.uel 3eilding Uaste Gas Decay Tank Enclosure 4"-GW-30-154-Q3 muar *c" ne:
Those ite..s li iting total settlement of stnicturcs are as folic.-is:
m Monitorine Points Limitine' Itsns
.C.Servic Water Pum Hot M.
CFSAR Predictic W (3)
Servica Suilding (E-17) 36"-t!5-1-151-Q3 G6"-WS-2-151 -O R-(t-N (36"-W5-3-151-03 7 (8 l)
C35"-W5-4-151 n T
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Turbine Building (S-91 )
24_"-WS-25-151-03 2
C 2d"-W5-42 5-151 -03 C b-D Fuel Oil Pump House 21 "-F0F-151 -5 1
Saron Recevery Tank Dike Q:0TZ (1)T (0
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ATTACHMENT 3 PROPOSED UNIT 1 SPECIFICATION PLAtlT SYSTEMS 3/4.7.12 SETTLE!!ENT OF CLASS 1 STRUCTURES LIf1ITIflG C0tIDITION FOR OPERATION 3.7.12.1 The total settlement of each Class 1 structure or the differential settlement between Class 1 structures shall not exceed the allowable values of Table 3.7-5.
()
APPLICABILITY: ALL MODES ACTI0ti:
a.
With either the total settlement of any structure or the differential settlement of any structures exceeding 75 percent of the allowable settlement, conduct an engineering review of field conditions and evalu-ate the consequences of additional settlement.
Submit a special report
?
to the Commission pursuant to Specification 6.9.2 within 60 days, con-taining the results of the investigation, the evaluation of existing and possible continued settlement, and the remedial action to be taken, if any, including the date of the next survey.
b.
With the total settlement of any structure or the differential settle-ment of any two structures exceeding the allowable settlement of i
Table 3.7-5, be in at least HOT STAtlDBY within 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and COLD SHUT-
/'N D0WN within the following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />.
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SURVEILLANCE REQUIREMENTS 4.7.12.1 The total settlement of each Class 1 structure or the differential settlement between Class 1 structures listed in Table 3.7-5 shall be determined to the nearest 0.01 foot by measurement and calculation at least once per 6 months.
fl0RTH ArtflA - UNIT 1
O O
TABLR 9.7-9 At.LOWADLE TOTAL OR DIFFERENTIAL SETTLEMENT FOR CLASS 1 STRUCTURES ALLOWADLE ALL O'<.'A U LE TOTAL-DIFFFP.E::TI AL SETTLEMDIT SETTLEMENT SETTLEME!!T' SETTLF::Z:!TI
_g,{p r f,JJ1))nUR POINT STRUCTURE /COMPONEllT (FEET)
(FFS2) 130 containmont Unit 1 223 Fuel Building N/A 0.12 130 containment Unit 1 129 Auxiliary Building N/A 0.12 143 Containment Unit 1 142 Unit 1 Safeguards Area N/A 0.04 144 containment Unit 1 145 Unit 1 Safeguards Area ~
N/A 0.04 149 Containment Unit 1 239 Unit 1 Main Steam Valve House N/A 0.12 144 Containment Unit 1 132, 199, 243 Service Building N/A 0.12
' nit 1 Main Steam Valve House N/A 0.07 U
146 Safeguards Area Unit 1 239 128 Auxiliary Building 238 Unit 1 Main Steam valve flouse N/A 0.08 229 Auxiliary Building 239 Unit 1 Main Steam Valvo !!ouse N/A 0.03 123 Auxiliary Building 224 Fuel Building N/A 0.05 129 Auxiliary Building 223 Fuel Building N/A 0.05 122 Auxiliary Building 119 Service Building Tunnol N/A 0.07 243, 132 Service Building (E-5, E-6) -238 Unit 1 Main Steam Valve House '
N/A 0.04 117
" Service Building (B-14) 113 Unit 2 Main Steam vaive Houso N/A 0.03 from 7/77 222 Auxiliary Feedwater Pump
' House Unit 1 248.
Pipo Tunnel N/A 0.12
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O O
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JJELF ~4.7-5 (CONT'D) 111,H'dELfJTAL OR DTIFEDENTI AlmSfftLE'T!T _FOR CLAES 1 STRQCTURPft ALL O'..'AD LE ALLO"ACLE TOTAL DIF. Er:'TT. AL SETTLE.':E!!T" SET rLEF':T 1 SETTLEM2:lT SETTLEMENT
,_Rol;J
,SJAUf,JyDE POLHT STRUCTURE / COMPONENT
__(FFET)
(r ?JT 223 Decontamination Building 250 Pipe Tunnel
!!/A 0.06 226 Fuel Du11' ding 251 Waste Gas Decay Tank N/A 0.06 Enclosure 141 Safeguards irea Unit 1 253 Unit 1 Casing cooling Building N/A 0.12 fren 2/79 7,10 Service Water Pump House 15,16, Service flater Piping 0 SilPH 17,18 North Side of Expansion Joint N/A 0.22 fron 7/77 8
Service Water Pump House H-569 Pipe Ifanger in Reservoir N/A 0.17 H-584 15,16,17,18 Service'Uater Piping 8 SUPH 0.22 from 8/73 1:/A North Side of Expansion Joint 204 Circulating Water Intake 0.15 l'/A Structure 158
- " Turbine, Building (D-9 1/2) 0.06
!!/A 114 Service Building (E-17) 0.09 I'/A
' 245, 246 Fuel Oil Pump House 0.03
!!/A 205, 207,
!!/A 203, 209 Boron Recovery Tank Dike 0.03 1
NORTH ANNA.- UNIT 1
O O
TABLE '4.7 85 (CONT'D)
ALLOWADLE TOTAL OR DlfFERENTIAL SETTLEMENT FOR CL.6SS 1 STDUCTUBFJ.
SETTLEMEllT SETTLEMENT ALLOWADLE OUT-OP-PL ANE DISTCRTIC'l POI!!T STRUCTURE POINT STRUCTURE /COMPONFtlT.
(rfcTi 7,0,9,10 Service Unter Pump House 7,8,9,10 Service Water Pump House 0.06 for any settlement point Sunless otherwise indicated, allowable settlements are from base-line clevations established in May 1976 or reference elevations corrected to May 1976 survey.
Critical differential settlement is downward movement of' point 117 with respect to point 113
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*llot Class 1 structure, but settle.;ent affects Class 1 pipelino.
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e NOTii ANNA - UNIT 1
l PLANT SYSTEftS BASES 3/4.7.12 SETTLEMENT OF CLASS 1 STRUCTURES In order to assure that settlement does not exceed allowable values, a program has been established to conduct a survey of a specified number of points at the site on a semiannual basis. The first survey was conducted in May,1976 to establish base-line elevations for most of the points.
Where applicable, the baseline elevations of points established subsequent to the May 1976 survey have been adjusted to the itay 1976 survey by an evaluation of the settlement records of scttlement points on the same structure or on nearby structures.
Baseline elevations for some points were established on dates other than May 1976 as indi-cated in Table 3.7-5.
Additional surveys will be performed semiannually.
The
()
determination of the elevation of the points shall be by precise leveling with second order Class II accuracy as defined by the U.S. Department of Commerce, National Oceanic and Atmospheric Adminstration, National Ocean Survey,19/4.
When any settlement point listed in Table 3.7-5 is inaccessible during a survey, comparison to allowable settlement shall be based on settlement of other points on the same structure or on nearby structures having similar foundation conditions.
When any settlement point listed in Table 3.7-5 is dislocated or replaced, a docu-mented review of the settlement records of points en the same structure and i
additionally points on nearby structures having similar foundation conditions shall provida a new reference elevatio'n for the point that reflects the estimated settle-ment since the base-line survey.
If the total settlement or differential settle-l ment exceeds 75 percent of the allowable. value, the frequency of surveillance shall be increased as dictated by the engineering review.
Allowable differential movement is controlled by pipe deflections permitted by fixation points in buildings.
The items limiting differential settlement are as follows:
Re ference Monitoring limiting Items Containment Unit 1 Fuel Building Fuel Transfer Tube Containment Unit 1 Auxiliary Building 3"-WGCB-14 Containment Unit 1 Unit 1 Safeguards Area 12 "-S I-1 Containment Unit 1 Unit 1 Main Steam Valve House 6"-SI-6 Containment Unit 1 Service Building (E-3) 32"-SHP-2 Safeguards Area Unit 1 Unit 1 Main Steam Valve House 8"- QS-3 Auxiliary Building Unit 1 Main Steam Valve House 8"-WS-113 Auxiliary Building Fuel Building 4"-RP-28 Auxiliary Building Service Building Tunnel 24"-WS-102 Service Building (E-5, E-6)
Unit 1 ilain Steam Valve House 24"-WS-26-151-Q3 Service Building (E-14)
Unit 2 tiain Steam Valve House 24"-WS-426-151-Q3 NORTH ANNA - UNIT 1
PLAtlT SYSTElis BASES 3/4.7.12 SETTLEf!EflT OF CLASS 1 STRUCTURES Re ference Monitoring Limiting Items Auxiliary Feedwater Pump House Unit i Pipe Tunnel 3"-WAPD-9-601-Q3 O-Decontamination Building Pipe Tunnel 3"- CC-90-151-Q3 Fuel Building Waste Gas Decay Tank Enclosure 4"-GW-30-154-Q3 Safeguards Area Unit 1 Unit 1 Casing Cooling Building 6"-RS-E15-153 A-Q3 Service Water Pump House Service Water Piping 0 SWPH Expansion Joint Service Water Pump House Pipe Hanger in Reservoir 24"-WS-11-151-Q3 Service Water Pump House Service Water Pump House Mat I
The itens limiting total settlement of structures are as follows:
O Monitoring Points Limiting Items Service Water Piping 0 SWPH 36"-WS-1-151-Q3 Circulating Water Intake Structure Service Water Piping Expansion Joint Turbine Building (B-91/2) 24"-WS-25-151-Q3 Service Building (E-17) 36"-WS-1-151-Q3 i
Fuel Oil Pump House 2 1/2 "-F0F-151 -S l
Boron Recovery Tank Dike No settlement expected; settlement in excess of 0.03 feet would indicate an abnormality.
tl0RTH Atifin - UllIT 1 I
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ATTACHMENT 4 PROPOSED UNIT 2 SPECIFICATl0tl I
PLAT!T SYSTEf!S 3/4.7.12 SETTLE!1ErlT OF CLASS 1 STRUCTURES LI!1ITING CO.'10ITION FOR OPERATIO?!
3.7.12.1 The total settlement of each Class 1 structure or the differential settlement between Class 1 structures shall not exceed the allowable values o f Table 3.7-5.
I APPLICABILITY: ALL tiODES ACTIOM:
a.
Ilith either the total settlement of any structure or the differential settlement of any structures exceeding 75 percent of the allowable settlement, conduct an engineering review of field conditions and evalu-j ate the consequences of additional settlement. Submit a special report to the Commission pursuant to Specification 6.9.2 within 60 days, con-taining the results of the investigation, the evaluation of existing and possible continued settlement, and the remedial action to be taken, if any, including the date of the next survey.
With the tot'l settlement of any structure or the differential settle-b.
a ment of any two structures exceeding the allowable settlement of
{s_}/
Table 3.7-5, be in at least HOT STAtlDBY within 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and COLD SHUT-00Utl within the following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />.
4 SURVEILLANCE REQUIREiiEflTS 4.7.12.1 The total settlement of each Class 1 structure or the differential settlement between Class 1 structures listed in Table 3.7-5 shall be determined to the nearest 0.01 foot by measurement and calculation at least once per 6 months.
fiORTH A!!ilA - UNIT 2
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. TABLE 1._7 'i N
ALLOVADLE TOTAL OR_J)TFFERENTIb1EITLf1ENT FOR_ CLASS 1 STRQClliffJ.
N ALLOWADLE ALLO','ABLE TOTAL DIFFERE!:TIAL SETTLEMENT SETTLEMENT SETTLEMEllT3 SETTLEMEUT8 JJ)1t;T STHQCIURG POINT STRUCTURE / COMPONENT _
(FFET)
(FFfT) 131 Containmont Unit 2
-224 Fue... Building N/A 0.12 131 Containment Unit 2 123 Auxiliary Building fl/A 0.05
.106 Containnont Unit 2 105 Unit 2 Safeguards Area N/A 0.07 107 Containment' Unit 2 108 Unit 2 Safeguards Area N/A 0.07 131 Containment Unit 2 124 Unit 2 Main Steam Valve llouse II/A 0.03
.. 107 Containment Unit 2 116 Service Building (E-15)
N/A 0.12 111 Safeguards Aren Unit 2 1214 Unit 2 Hain Steam Valve !!ouse if/A 0.12 122 Auxiliary Building 120 bnit 2 Main Steam Valvo !!ouse 11/A 0.04
~
123 Auxiliary Building 1214 Unit 2 Main Steam Valve !!ouse N/A 0.04
~
123 Auxiliary Building 2218 Fuel Building U/A 0.05 129 Auxiliary Building 223 Fuel Building II/A 0.05 122 Auxiliary Building 119 Servloe Duilding Tunnel
!!/A 0.07 2!3, 132 Service Building (E-5, E-6) 238 Unit 1 Main Steam Valvo !!ous's ll/A 0. 0 11 117
" Service Building (E-lii) 113 Unit 2 Hain Steam Valvo !!ouse
!!/A 0.03 fron 7/77 231 Auxiliary Feedwater Pump llouse Unit 2 2119.
Pipo Tunnel N/A 0.12 j
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O x 4:.!
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I
'.,k IlE" 1.7-5' (CONT'D)
E10FEL.E TOTAL OD DTFFEDENTIM_ff]J1DiC,y] F0D C. LASS 1 STDifCTllDJ.J.
ALLOWADLE ALLOWAELE TOTAL DIFFEP.E!!TIAL SETTLEVENT SETTLEMENT SETTLEMENT 4 SETTLEME:!T 5 PQINT STRtfCTifDE POINT STDl!CTill18/ COMPONENT (FRET)
(FECT) 220 Decontamination Building 250 Pipe Tunnel N/A 0.05 i
226 Fuel Building 251 Waste cas Decay Tank II/A 0.06 Enclosure 1011'
, Safeguards Area Unit 2 2511 Unit 2 Casing Coo'ing Building N/A 0.12 from 2/7C l
7,10 Service 11ater Pump House 15.16, service Water Piping 0 SUPH l
17,18 North Side of Expansion Joint N/A 0.22 fron 7/77 l
l
~
8 Service Water Pump llouse
!!-569 Pipo llanger in Reservoir-N/A 0.17 H-50!I 15,16,17,18 Service Unter Piping 0 SWPl!
0.22 from 8/70 N/A North Side of Expansion Joint 20!1 Circulating Water Intake 0.'15 N/A Structure 0.06 II/A 158 888 Turbine Building (B-9 1/2) 1111 Service Building (F-17) 0.09 N/A l
I 0.03 N/A 2!!5, 246 Fuel Oil Pump House l
206, 207, 208, 209 Doron Recovery Tank Dike 0.03 N/A 1
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o JAD_LE 1.7-5 (CONT'D) yp JLLOWABLE TOTAL OR DTFFEDENTIAL SEIILEMENT FOR CLASS 1STMCJMtf1 SETTLEMENT SETTLEMENT ALLOWADLE OUT-C"-PLA!!E DISTORTIO!!
_,_f3 TNT STRUCTUDE POINT STDUCTUDE/COMEONENT (FECT) 7,8,9,10 Servico Unter Pump !!ouso 7,8,9,10 Service Water Pump flouse 0.06 for any settlement point 8Unicas otherwiso indicated, allouable settlements are from base-line elevations established in !!ay 1976 or referenco clovations corrected to May 1976 survey.
" Critical differential settlement is downward movement of point 117 with respect to point 113 8 8 8 Hot Class 1 structure, but sottlement affects Class 1 pipeline.
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4 4
4 9
7 t
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NORTH ANNA - UNIT 2
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i.
PLANT SYSTEMS BASES 3/4.7.12 SETTLEllENT OF CLASS 1 STRUCTURES
)
In order to assure that settlement does not exceed allowable values, a program has been established to conduct a survey of a specified number of points at the site on a semiannual basis. The first survey was conducted in May 1976 to establish base-line elevations for most of the points.
Where applicable, the i
baseline elevations of points established subsequent to the May 1976 survey have been adjusted to the May 1976 survey by an evaluation of the settlement i
records of settlement points on the same structure or on nearby structures.
i Baseline elevations for some points were established on dates other than May 1976 l
as indicated in Table 3.7-5.
Additional surveys will be performed semiannually.
The determination of the elevation of the points shall be by precise leveling 1
with second order Class II accuracy as defined by the U.S. Department of Commerce, National Oceanic and Atmospheric Administration, National Ocean Survey,1974.
When any settlement point listed in Table 3.7-5 is inaccessible during a survey, comparison to allowable settlement shall be based on settlement of other points on the same structure or on nearby structures having similar foundation conditions.
When any settlement point listed in Table 3.7-5 is dislocated or replaced, a docu-mented review of the settlement records of points on the same structure and addi-tionally points on nearby structures having similar foundation conditions shall lr provide a new reference elevation for the point that reflects the estimated settle-ment since the base-line survey.
If the total settlement or differential-settle-ment exeeds 75 percent of the allowable value, the frequency of surveillance shall be increased as dictated by the engineering review.
I Allowable differential movement is controlled by pipe deflections permitted by l
fixation points in buildings. The items limiting differential settlement are as follows:
Re ference Monitoring Limiting Items Containment Unit 2 Fuel Building Fuel Transfer Tube i
Containment Unit 2 Auxiliary Building 3"-SI-417 Containment Unit 2 Unit 2 Safeguards Area 6"-RH-418-l Containment Unit 2 Unit 2 Main Steam Valve House 6"-SI-416 Containment Unit. 2 Service Building (E-15) 16"-WFPD-409 i
Safeguards Area Unit 2 Unit 2 Main' Steam Valve House 24"-WS-426 Auxiliary Building Unit 2 Main Steam Valve House 8"-SI-440 Auxiliary Building Fuel Building 4"- RP-28 Auxiliary Building Service Building Tunnel 24"-WS-102 Service Building (E-5, E-6)
Unit 1 Main Steam Valve House 24"-US-26-151-Q3 Service Building (E-14)
Unit 2 Main Steam Valve House 24"-WS-426-151-Q3 i
NORTH ANNA.- UNIT 2 l
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PLAflT SYSTEMS BASES
_3/4.7.12 SETTLEf1EllT OF CLASS 1 STRUCTURES i
l t
Re ference Moni torin g Limiting Items Auxiliary Feedwater Pump House Unit 2 Pipe Tunnel 6"-WCMU-412-151-Q3 Decontamination Building Pipe Tunnel 3"- CC-90-151 -Q3 Fuel Building Waste Gas Decay Tank Enclosure 4"-GW-30-154-Q3
()
Safeguards Area Unit 2 Unit 2 Casing Cooling Building 6"-RS-455-153A-Q3 Service Water Pump House Service Water Piping 0 SWPH Expansion Joint Service Water Pump House Pipe Hanger in Reservoir 24"-WS-ll-151-Q3 Service Water Pump House Service Water Pump House Mat The items limiting total settlement of structures are as follows:
Monitoring Points Limiting Items Service Water Piping 0 SWPH 36"-WS-1-151-Q3 Circulating Water Intake Structure Service Water Piping Expansion Joint O
Turbine Building (B-91/2) 24"-US-425-151-Q3 Service Building (E-17) 36"-WS-1-151-Q3 Fuel Oil Pump House 2 1/2"-F0F-151-S Boron Recovery Tank Dike No settlement expected; settlement in excess of 0.03 feet would indi-cate an abnormality.
t l
l I
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l NORTH AtlNA - Ut:IT 2
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