ML18136A143
| ML18136A143 | |
| Person / Time | |
|---|---|
| Site: | Surry  |
| Issue date: | 09/19/1979 |
| From: | Burnett P, Whitener H NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| To: | |
| Shared Package | |
| ML18136A144 | List: |
| References | |
| 50-280-79-47, 50-281-79-66, NUDOCS 7911050416 | |
| Download: ML18136A143 (5) | |
See also: IR 05000280/1979047
Text
... .,;
UNITED STATES
NUCLEAR REGULATORY COMMISSION
REGION II
101 MARIETTA ST., N.W.,SUITE 3100
ATLANTA, GEORGIA 30303
Report Nos. 50-280/79-47 and 50-281/79-66
Licensee:
Virginia Electric and Power Company
Richmond, Virginia 23261
Facility Name:
Surry Unit 1 and 2
Docket Nos. 50-280 and 50-281
License Nos.
Inspected at Surry, Virginia
Inspected by:~~
H.
.
1t: ner
Approved by:~,,:,.;,zc-k
.T.retf;l\\.cting Section Chief
SUMARY
Inspected on August 1-3, 1979
Areas Inspected
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Date Signed
9-/~2,9
Date Signed
This special, unannounced inspection involved 23 inspector hours onsite in the
areas of piping support and restraint systems and followup inspection of out-
standing items.
Results
Of the two areas inspected, no items of noncompliance or deviations were iden-
tified.
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DETAILS
1.
Persons Contacted
2.
Licensee Employees
- J. L. Wilson, Superintendent Operations
- T. A.,Peebtes, Superintendent Technical Services
- D. A. Christian, Engineering Supervisor
- M. R. Kansler, Associate Engineer
- F. L. Rentz, Resident QC Engineer
D. Kildoo, Station QC Inspector
D. Stoeckel, Engineering Technician, QC
NRC Resident Inspector
- D. J. Burke
- Attended exit interview
Exit Interview
The inspection scope and findings were summarized on August 3, 1979, with
those persons indicated in Paragraph 1 above.
During this discussions of
piping support and restraint systems, the licensee made certain commitments
as follows:
a.
Make temperature corrections to functional test data, and verify
operability at operating temperature prior to Unit 1 and Unit 2 startup
(Paragraph 3).
b.
Establish lifetime of non-ethylene propylene seal material by November 1,
1979 (Paragraph 3).
c.
Evaluate piping subject to snubber failures, and verify that pipe
damage or overstress did not occur prior to Unit 1 or Unit 2 startup
(Paragraph 5) .
Previously identified unresolved items were discussed and item (78-13-09)
was closed.
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3.
Licensee Action on Previous Inspection Findings
(Open) - Unresolved Item (78-13-04) concerned the failure to establish
acceptance criteria to correct snubber functional test data from test
temperature to operating temperature.
The licensee indicated that the
-*architect engineer is in the process of developing criteria for* applying
temperature corrections to snubber functional test data.
These criteria
are not complete and are not available for use at this time.
The inspector
advised the licensee that the NRC has issued NUREG 0467.
Appendix C of
NUREG 0467 cont~ins interim guidance on acceptable lock-up and bleed velocities
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relative to temperature conditions.
The licensee stated that temperature
corrections would be applied to the functional test data and all snubbers
would be verified to be in the correct velocity ranges for lock up and
bleed at operating temperature prior to startup of Unit 1.
The licensee also stated that the same type of temperature corrections
would be made to the functional test data for Unit 2 snubbers to verify
operability of these snubbers prior to startup of Unit 2.
This matter remains unresolved pending review of corrected *test data.
(Open) - Unresolved Item (78-13-08) concerned the correction of Unit 1,
1978 snubber functional test data from test temperature to operating tem-
perature.
This matter is associated with the above item (78-13-04), and
remains unresolved.
(Open) - Unresolved Item (78-13-05) concerned the failure to identify those
snubbers in Unit 1 and Unit 2 which do not contain ethylene propylene (EP)
seal material.
The inspector found that the licensee has developed a
snubber-information computer listing, which includes replacement of snub-
bers and replacement of seals. However, a formal review of these data to
identify those snubbers remaining in Unit 1 and Unit 2 which do not have EP
seal material has not yet been performed.
This matter is related to the
determination of an expected seal lifetime for non EP seal material which
is discussed in unresolved Item (78-13-06) below.
At the exit interview,
licensee management stated that snubbers with non-EP seal material would be
identified by November 1, 1979.
This item remains unresolved.
(Open) - Unresolved .Item (78-13-06) concerned the need to establish an
expected lifetime for snubber seal material which is non-ethylene propylene
material or to inspect snubbers with seal material not compatible with the
environment at a 31 day interval.
On issuance of the snubber Technical
Specifications 3.20 and 4.17 the licensee evaluated all safety related
snubbers on the basis of operating experience and maintenance records.
Snubbers with seal*material determined not compatible with the operating
environment were listed in a periodic test (PT 39.1) for inspection at 31
day intervals. <Ner a period of time seals in these snubbers have been
replaced with ethylene propylene seal material, and the snubber removed
from the 31 day inspection list (PT 39.1).
An audit by the licensee's
quality assurance group, audit no.
S78-9, dated October 5, 1978 and
response to the audit findings dated Octobe~ 17, 1978, January 10, 1979 and
April 4, 1979 show that snubbers listed in PT 39.1 as of March 2, 1977 have
been tracked.
Any discrepancies regarding replacement of seal materialwith
ethylene propylene seals have been identified, corrected and documented.
The safety related snubbers not listed in PT 39.1 were judged to have seal
material (non-EP type) compatible with the operating environment, and were
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identified for inspection accordil!-g to the Technical Specification f re-
quency table.
From discussions with licensee personnel it appears that
although a large number of this group of snubbers have been rebuilt with EP
seal material, some snubbers still contain non-EP seals.
The licensee has
not determined the expec~ed lifetime for this non-EP seal material based on
material characteristics and operating environment.
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At the exit interview the licensee stated that in conjunction with iden-
tification of installed non-EP seal material (item 78-13-05 above) the seal
lifetime will be determined for the particular non-EP seal material in use.
This item remains unresolved.
(Open) - Unresolved Item (78-13-07) concerned the traceability of Unit 1
snubber records relative to snubber serial number size, location and type
of seal material.
This item was not reviewed at this inspection and remains unresolved.
(Closed) - Unresolved Item (78-13-09) concerned developing a method for
selection of snubbers to be functionally tested.
Snubbers to be tested are
selected by a random number generator process from the listing in the
computer.
This item item is considered closed.
4.
Unresolved Item
s.
Unresolved items were not identified during this inspection.
Status of Plant Snubbers
During functional testing of snubbers in Unit 2, 19 out of 30 snubbers
tested were found to be out of the specified velocity ranges for lockup or
bleed.
Since Unit 2 is in a long term outage and Unit 1 is preparing for
startup., the licensee shifted testing activity to Unit 1 snubbers to deter-
mine if a problem existed.
Of 74 Grinnell snubbers functionally tested in
Unit 1, 21 did not meet the specified velocity ranges.
The majority of
these failures were associated with a bleed rate slightly less than the
2-inches-per-minute lower limit identified in the test procedure.
In June,
1978 the licensee had tested all snubbers in Unit 1 (80) with the exception
of the 74 tested during this outage.
A sample of 10 snubbers from that
group of 80 snubbers, which were tested and determined operable in 1978,
were retested in August, 1979.
All 10 of these met the lockup and bleed
requirements, and showed no apparent drift toward the lower lockup or bleed
velocity limits.
The licensee believes a setpoint drift is occurring over a long period of
time and that velocities found within the acceptable velocity range during
testing in 1977 but near the lower limit haye drifted out of the specifi-
cations.
At the conclusion of this inspection the licensee had not clearly
established the cause of a setpoint drift, and had not completed an analysis
of functional test data to support the above hypothesis.
The inspector
will review these matters during a subsequent inspection (280/79-47-01).
~-The inspector discussed the need to evaluate the pipi~g systems-to insure
that snubber failure had not caused adverse effects such as pipe damage or
over stress. At the exit interview the licensee stated that this evalua-
tion would be complet~d prior to Unit 1 startup (280/79-47-02). -
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6.
Containment Tour
The inspector and the IE Resident Inspector performed an inspection of
installed pipe-support and restraint hardware in the containment building.
Several problems were identified, and reviewed with the licensee as follows:
a.
General Finding
A large number of snubbers showed accumulations of dirt and excess
oil.
These snubbers should be cleaned up in time to allow any fluid
- leaks to be evident during visual inspection.
b.
Specific Findings
RC-118
d~Qrisobserved in the reservoir fluid
RH-11- turned upside down due to loose locknut
The Resident IE Inspector will follow the resolution of these
discrepancies.
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