ML20211B622
| ML20211B622 | |
| Person / Time | |
|---|---|
| Site: | Vermont Yankee File:NorthStar Vermont Yankee icon.png |
| Issue date: | 02/10/1987 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML20211B628 | List: |
| References | |
| NUDOCS 8702190460 | |
| Download: ML20211B622 (13) | |
Text
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UNITED STATES 8"
/* g NUCLEAR REGULATORY COMMISSION o
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.E WASHINGTON, D. C. 20655
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SAFETY EVALUATION BY THE OFFICE OF NUCLEAR REACTOR REGULATION, RELATED TO THE INSERVICE INSPECTION PROGRAtt AND REQUESTS FOR RELIEF VERMONT YANKEE NUCLEAR POWER CORPORATION VERMONT YANKEE NUCLEAR POWER STATION DOCKET NO.: 50-271 INTRODUCTION The Technical Specification for the Vermont Yankee Nuclear Power Station states that inservice examination of ASME Code Class 1, 2, and 3 components shall be performed in accordance with Section XI of the ASME Boiler and Pressure Vessel Code and applicable Addenda as required by 10 CFR 50.55a(g) except where specific written relief has been granted by the Commission.
Some plants were designed in conformance to early editions of this Code Section, consequently certain requirements of later editions and addenda of Section XI are impractical to perform because of the plants' design, component geometry, material of construction or the need for extensive temporary modifications and the resultant substantial exposure to plant personnel. Regulation 10 CFR 50.55a(g)(6)(1) authorizes the Commission to grant relief from those requirements upon making the necessary findings.
By letters dated November 27, 1984, December 30, 1985, and August 1, 1986 Vermont Yankee Nucicar Power Corporation (licensee) submitted its inservice inspection program, and additional information related to requests for relief from certain Code requirements detennined to be impractical to perform on the Vermont Yankee Nuclear Power Station during the second inspection interval.
The program is based on the requirements of the 1980 Edition through Winter 1981 Addenda of Section XI of the ASME Code, and remains in effect until November 30, 1992 unless the program is modified or changed prior to the interval end date.
EVALUATION The inservice inspection program and the requests for relief from the requirements of Section XI that have been determined to be impractical to perform have been reviewed by the staff's contractor, Science Applications International Corporation.
Presented in attachment 2 is the contractor's Technical Evaluation Report, which is their evaluation of the licensee's inservice inspection program plan and relief requests. Also included in the TER are their conclusions and recommendations. The staff has reviewed the TER and agrees with the evaluations and conclusions. A summary of the relief request determinations made by the staff is presented in the tables of attachment 1.
The granting of relief is based upon the fulfillment of any commitments made by the licensee in its basis for the relief request and the alternate proposed examinations, h2190460070210 0
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.. CONCLUSION Based on the review of the inservice inspection program and relief requests summarized, the staff concludes, that relief granted from the code-required i
examination and testing requirements and with the alternate methods imposed through this document, will still provide reasonable assurance of the piping and component pressure boundary and support structural integrity. The staff has determined that pursuant to 10 CFR 50.55a(g)(6)(1) granting relief where the Code requirements are impractical is authorized by law and will not endanger life or property, or the common defense and security. The staff has also concluded that granting relief is otherwise in the public interest considering the burden that could result if the requirements were imposed on the facility. During the review of the licensee's inservice inspection plan the staff has not identified any significant misinterpretation or emissions of Code requirements. Thus the inservice inspection plan is acceptable for implementation.
Principal Contributor:
B. Turovlin Dated:
February 10, 1987 Attachments:
As stated
ATTACHMENT 1 TABLE 1 CLASS 1 COMPONENTS LICENSEE PROPOSED LICENSEE'S IWB-2500-1 IWB-2500 SYSTEM OR AREA TO BE REQUIRED ALTERNATE RELIEF REQUEST REQUEST NO.
ITEM N0.
EXAM CAT.
COMPONENT EXAMINED METHOD EXAMINATION STATUS 8-1 Bl.11 B-A Reactor Circumferen-Volumetric None for Granted Vessel tial Shell Bl.11 See Note I welds 81.12 Longitudinal Volumetric Accessible Shell Welds Length of
~ ~ ~ -
Bl.12 1001 Each Inspection Interval B-3 B8.10 B-H Reactor Integrally Volumetric Accessible Granted Vessel Welded or Surface as portion of attach-applicable vessel support ment skirt exam by volumetric and surface from l
outside skirt enclosure.
E i
Upper portion of stabilzer brackets exam by surface I'
TABLE 1 CLASS 1 COMP 0NENTS (CONTINUED)
LICENSEE PROPOSED LICENSEE'S IWB-2500-1 IWB-2500 SYSTEM OR AREA TO BE REQUIRED ALTERNATE RELIEF REQUEST REQUEST NO.
ITEM NO.
EXAM CAT.
COMPONENT EXAMINED METHOD EXAMINATION STATUS B-4 B9.11&
B-J Piping-Circum-B9.11:
First accessible Granted B9.21 Contain-ferential Surface &
process pipe weld ment Pene-Welds, B9.11: Volumetric outside contain-tration Nominal Pipe 89.21:
ment. Volumetric Pipe-to-Flued Size 4 in.
Surface once interval.
Head welds.
& Greater, Visual during Main steam A, B9.21:
hydrostatic B, C & D within contain-Feedwater ment.
A and B RHR Supply RHR Return B and C HPCI Steam Supply RCIC Steam Supply Core Spray A and B B-5 B9.11 B-J Piping Main Nominal Pipe Surface &
Visual during Granted Steam Line Size 4 in.
Volumetric Hydrostatic test Welds A4 and
& Greater, Volumetric to i
D4 B9.11:
extent practical Circumferential if supports removed
- Welds, l
e
TABLE 2 CLASS 2 COMPONENTS LICENSEE PROPOSED LICENSEE'S IWB-2500-1 IWB-2500 SYSTEM OR AREA TO BE REQUIRED ALTERNATE RELIEF REQUEST REQUEST NO.
ITEM NO.
EXAM CAT.
COMPONENT EXAMINED METHOD EXAMINATION STATUS C-1 C2.20 C-B Nozzle in Vessels in. Nom.
Thickness C2.21 Nozzle-to-Surface Surface and Granted RHR Heat Shell and Volumetric Exchanges Volu-on reinforce-metric ment saddle-to-nozzle and saddle-to-vessel C-2 C3.40 C-C Piping Integrally Surface Visual Granted Welded attach-see note 2 ments.
i H-1 C7.21 C-H Pressure Suction and Visual Visual during Relief not Retaining Discharge VT-2 monthly surveill-needed.
I components piping from During ance testing.
Torus to fixed system shutoff valve. Hydrostatic RHR, CS, HPC1, Pressure i
RCIC systems Test.
H-2 C7.21 C-H Pressure Piping
- Visual, Visual Granted Retaining between VT-2 during Components valves during monthly V11-11 system surveill-and V11-41 Hydro-ance testing SLC pumps static and operator pressure rounds.
i
TABLE 2 CLASS 2 COMPONENTS (continued)
LICENSEE PROPOSED LICENSEE'S IWB-2500-1 IWB-2500 SYSTEM OR AREA TO BE REQUIRED ALTERNATE RELIEF REQUEST REQUEST NO.
ITEM NO.
EXAM CAT.
COMPONENT EXAMINED METHOD EXAMINATION STATUS
{
H-3 C7.21 C-H Pressure Piping Visual Test connect-Granted Retaining between VT-2 Class 1 Components valves during hydro V11-15 hydro-and V11-16 static and connect-pressure ion of V11-16 test to V11-36 at 1.10 times
[
system pressure.
H-4 C7.21 C-H Same as Piping Same as Containment Granted
- ,l above Radwaste above isolation Piping to portions
{
RHR system from reactor
{
bldg. floor
[l drain down-
[
stream valves f
319A to D H-5 C7.21 C-H Same as Piping Same as Same as above Denied.
above Radwaste above Insufficient Justification
-l Drywell Sump Pump Dis-charge from penetrations X-18 and X-19 to valves l
A0-83 and A0-95
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w TABLE 2 1-CLASS 2 COMPONENTS (continued)
LICENSEE PROPOSED LICENSEE'S IWB-2500-1 IWB-2500 SYSTEM OR AREA TO BE REQUIRED ALTERNATE RELIEF REQUEST REQUEST NO.
ITEM NO.
EXAM CAT.
COMPONENT EXAMINED METHOD EXAMINATION STATUS H-6 C7.21 C-H Pressure Piping line
- Visual, Line CUW-55 Denied.
Retaining CUW-55 VT-2 between valves Insufficient Components between during V12-62 will be Justification valves system included in V12-63 and hydro Class 3 1.23 P sv V12-62 static test of line pressure CUW-54 test at 1.10 times Systems Pressure H-7 C7.21 C-H Same as Piping down-Same as Subject lines Relief not above stream of above tested during needed HPCI M0V23-19 feedwater system and RCIC test.
M0V13-21 1.
H-8 C7.21 C-H Pressure Piping-Same as Periodic Denied.
i Retaining Service above pneumatic Insufficient Components and Instru-leak rate Justification I
ment Air test Systems H-9 C7.21 C-H Same as Piping Same as Containment Denied.
above Atmos-above isolation Insufficient phere portions Justification Control of system system tested at 44 psig during type " A
leak rate test every 33 1/3 years
o
,7 i
TABLE 2 CLASS 2 COMPONENTS (continued)
LICENSEE PROPOSED LICENSEE'S IWB-2500-1 IWB-2500 SYSTEM OR AREA TO BE REQUIRED ALTERNATE RELIEF REQUEST REQUEST NO.
ITEM NO.
EXAM CAT.
COMPONENT EXAMINED METHOD EXAMINATION STATUS H-10 C7.21 C-H Pressure Piping-
- Visual, Containment Denied.
Retaining Contain-VT-2 isolation Insufficient Components ment Air during portions of Justification Sampling system system tested System hydro-at 44 psig static during type pressure "A" leak test at rate test 1.10 3 1/3 years times system pressure H-11 C7.21 C-H Same as Piping-Air Same as Same as Denied.
above Dilution above above Insufficient System Justification contain-i ment pene-tration to second out-board iso-i lation valve j
H-12 C7.21 C-H Same as Piping-CRD Same as Substantial Denied.
above water piping above Portions of and hydraulic piping experi-control units ence hydrostatic test at 1080 psig.
Balance of system functions at 1040 1500 psig.
m TABLE 2 CLASS 2 COMP 0NENTS (continued)
LICENSEE PROPOSED LICENSEE'S IWB-2500-1 IWB-2500 SYSTEM OR AREA TO BE REOUIRED ALTERNATE RELIEF REQUEST REQUEST NO.
ITEM NO.
EXAM CAT.
COMPONENT EXAMINED I ETHOD EXAMINATION STATUS H-13 C7.21 C-H Pressure Piping-
- Visual, Containment Denied.
Retaining Standby VT-2 isolation Insufficient Components Gas during portion Justification Treatment system tested to System hydro-44 psig Contain-static during ment purge pressure type "A" lines tests at leak rate system ^ test ~
pressure every 3 1/2 years H-16 C7.21 C-H Same as Recircu-Same as Same as Same as above lation Pump above above above Seal Purge System H-17 C7.21 C-H Same as Condensate Same as Piping experiences Granted above Storage Tank above constant static P.
(CST) suction head 6-25 psig.
n lines from Piping is MOVHCPI-17 visible during and RCIC-18 routine surveill-to check ance valves H-19 C7.21 C-H Same as PJIR By pass Same as Piping included Denied above line RHR-13H above in lower press-
-138 between ure pump suction valves V10-69A hydrostatic
-69B and VIO-test 16A--16B
O TA8LE 2 CLASS 2 COMPONENTS (continued)
LICENSEE PROPOSED LICENSEE'S IWB-2500-1 IWB-2500-SYSTEM OR AREA TO BE REQUIRED ALTERNATE RELIEF REQUEST REQUEST NO.
ITEM NO.
EXAM CAT.
COMPONENT EXAMINED METHOD EXAMINATION STATUS H-20 C7.20 C-H Pressure CRD Scram
- Visual, Manual scram See Note 3 Retaining Discharge VT, not initiated.
Components lines during After all system reactor scram pressure events, visual test for leaks H-21 C7.21 C-H Same as Same as
- Visual, After all Granted above above VT, reactor 89 3/4 in.
during scrans lines system
- events, between hydro visual scram static for leaks.
.7 outlet test at valves 1.10 times and V13-system 112 manual pressure valves 2
H-18 C7.21 C-11
~ Pressure Turbine
- Visual, Piping will Granted Retaining Steam VT-2 be included Components Line during in 188 psig System system test of hydro turbine static casing pressure and exhaust test at lines 1.10 times system pressure
a O
TABLE 2 CLASS 2 COMPONENTS (continued)
LICENSEE PROPOSED LICENSEE'S IWB-2500-1 IWB-2500 SYSTEM OR AREA TO BE REQUIRED ALTERNATE RELIEF REQUEST REQUEST NO.
ITEM NO.
EXAM CAT.
COMPONENT EXAMINED METHOD EXAMINATION STATUS EXEMPTIONS Exemptions from Licensee Basis is Denied.
examination of exemptions are allowed Insufficient portions of following by 1974 Edition Summer Supporting systems RCIC, SLC 1975 Addenda data of Sampling, CAD, HPCI, chemistry RWC, CRD, Radwaste, control and RHR P
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y s
TABLE 3 CLASS 3 COMPONENTS LICENSEE PROPOSED LICENSEE'S IWB-2500-1 IWB-2500 SYSTEM OR AREA TO BE REQUIRED ALTERNATE RELIEF REQUEST REQUEST NO.
ITEM NO.
EXAM CAT.
COMPONENT EXAMINED METHOD EXAMINATION STATUS-H-14 DI.10 D-A Pressure Piping Visual,- Operator Granted Retaining Service VT-2 Surveillance Components Water during return system and pressure service test.
water supply to fire pro-I tection systems between valves V70-5A and SB H-18 D2.10 D-B Pressure Turbine
- Visual, Piping will Gr' anted Retaining Steam VT be included Components Line during in 188 psig i
System system test of turbine l'
pressure casing and L
test.
exhaust lines l'
H-15 DI.10 D-A Same as Advanced
- Visual, In leakage Granted above off-gas (A06) VT flow System guard during detected i
beds and hydro by instru-absorbers static ments.
pressure s'
test at 1.10 times system
[-
t pressure
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i Note 1.
Relief is granted provided that the examination of the accessible Category B-A, Item 81.20 head welds is increased to achieve (1) an examination sample whose total weld length is equal to that required for the Category B-A, Items Bl.11 and Bl.12 welds for which relief was requested; or (2) 100% of the length of each accessible Category 8-A, Item Bl.20 weld, whichever is less.
Note 2.
Relief is granted provided that:
(a) the outermost welds at each end of each saddle are Code examined.
(b) All subject welds are visually examined during system pressure tests for evidence of leakage.
Note 3.
Relief is not granted from the performance of the Code-required functional tests.
However, schedular relief is granted to perform the three tests any time during the interval, thus increasing the chance of actual reactor scrams occurring.
Functional tests will include visual (VT-2) examination by a qualified inspector.
If at least three reactor scrams do not occur during the interval three manual scrams should be initated and the subject VT-2 examinations should be performed by the end of the interval.
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