ML20086A716

Proposed Tech Specs Re Performance of Reactor Shutdown & Drywell to Inspect Snubbers in Svc for Only 12 Months

ML20086A716
Person / Time
Site:	Oyster Creek
Issue date:	06/26/1995
From:	GENERAL PUBLIC UTILITIES CORP.
To:
Shared Package
ML20086A699	List: ML20086A697 ML20086A705 ML20086A716
References
NUDOCS 9507050020
Download: ML20086A716 (4)

Text

,

e Q. Shock Suppressors (Snubbers)  ;

As used in this specification, " type of snubber" shall mean snubbers of the same design and manufacturer, irrespective of capacity.

1. Each snubber shall be demonstrated OPERABLE by performance of the following inspection program:

a. Visualinspections Snubbers are categorized as inaccessible or accessible during reactor operation.

Each of the categories (inaccessible and accessible) mr, be inspected independently according to the schedule determined by Table 4.5-1. The visual inspection interval for each type of snubber shall be determined based upon the criteria provided in Table 4.5-1.

b. VisualInspection Acceptance _ Criteria Visual inspections shall verify that: (1) that there are no visible indications of damage or impaired OPERABILITY (2) attachments to the foundation or supporting structure are functional; and (3) fasteners for the attachment of the snubber to the component and to the snubber anchorage are functional. Snubbers which appear inoperable as a result of visual inspections shall be classified as unacceptable and may be reclassified as acceptable for the purpose of establishing the next visual inspection interval, providing that: (1) the cause of the rejection is clearly established and remedied for that particular snubber and for other snubbers irrespective of type that may be generically susceptible; and (2) the affected snubber is functionally tested in the as-found condition and determined OPERABLE per Specification 4 5.Q.d or 4.5.Q.e. 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 inoperable and the ACTION requirements shall be met.

c. Functional Tests At least once every 24 months, a representative sample (10% of the total of each type of snubber in use in the plant) shall be functionally tested either in place or in a bench test. For each snubber that OYSTER CREEK 4.5-9 Amendment No.: 141 95o7o5002o 950626 PDR ADOCK 05000219 P PDR L.

developed at the Savannah River Laboratory which were described in the Ninth AEC Cleaning

. Conference.*

High efficiency particulate filters are installed before and after the charcoal filters to minimize potential releases of paniculates to the environment and to prevent clogging of the iodine filters, An efficiency of 99% is adequate to retain paniculates that may be released to the reactor building following an accident. This will be demonstrated by testing with DOP at testing medium.

If laboratory tests for the adsorber material in one circuit of the Standby Gas Treatment System are unacceptable, all adsorber material in that circuit shall be replaced with adsorbent qualified l

according to Regulatory Guide 1.52. Any HEPA filters found defective shall be replaced wit those qualified with Regulatory Position C.3.d of Regulatory Guide 1.52.

The snubber inspection frequency is based upon the number of unacceptable snubbers found during i the previous inspection, the total population or category size for each snubber type, and the j previous inspection interval. A snubber is considered unacceptable if it fails to satisfy the i acceptance criteria of the visual inspection. Snubbers may be categorized, based upon their  ;

accessibility during power operation, as accessible a: inaccessible. These categories may be examined separately or jointly. However, that decision must be made and documented before any inspection and used as the basis upon which to detennine the next inspection interval for that category.

If continued operation cannot be justified with an unacceptable snubber, the snubber shall be declared inopemble and the applicable action requirements met. To detennine tht, next surveillance interval, the snubber may be reclassified as acceptable if it can be demonstrated that the snubber is operable in its as-found condition by the perfonnance of a functional test and if it satisfies the acceptance criteria for functional testing.

The next visual inspection interval may be twice, the same, or reduced by as much as two-thirds of the previous inspection interval. This interval depends on the number of unacceptable snubbers found in proponion to the size of the population or category for each type of snubber included in the previous inspection Table 4. 5-1 establishes the length of the next visual inspection interval.

To funher increase the assurance of snubber reliability, functional test should be perfonned once each refueling cycle. these tests will include stroking of the snubbers to verify proper piston movement, lock-up and bleed. Ten percent represents an adequate sample for such tests.

Observed failures of these samples require testing of additional units.

After the containment oxygen concentration has been reduced to meet the specification initially, the containment atmosphere is maintained above atmospheric pressure by the primary containmer.t inening system. This system supplies nitrogen makeup to the containment so that the very slight leakage from the containment is replaced by nitrogen, funher reducing the oxygen concentration.

In addition, the oxygen concentration is continuously recorded and high oxygen concentmtion is annunciated. Therefore, a weekly check of oxygen concentration is adequate. This system also provides the capability for detennining if there is gross leakage from the containment.

I

• D.R. Muhhbier, "In Place Nondestructive Ixak Test for Iodine Adsorbers," Proceedings of the i Ninth AEC Air Cleaning Conference, USAEC Report CONF-660904,1966 ,

OYSTER CREEK 4.5-15 Amendment No.:

100 c

(. ..

4 TABLE 4.5-1 L SNUBBER VISUAL INSPECTION INTERVAL Page 1 of 2

_ NUMBER OF UNACCEPTABLE SNUBBERS _

Population Column A Column B Column C or Category Extend Interval Repeat Interval Reduce interval (Notes 1,2) (Notes 3.6) (Notes 4,6) (Notes 5.6) 1 0 0 1 80 0 0 2 100 0 1 4 Note 1: The next visual inspection interval for a snubber population or category size l shall be determined based upon the previous inspection interval and the j number of unacceptable snubbers found during that interval. Snubbers may be categorizcJ, based upon their accessibility during power operation, as accessible or inaccessible. These categories may be examined separately or jointly. Ilowever, the decision on how to categorize the snubbers must be made and documented 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 permissable. 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 l in Column A, the next inspection interval may be twice the previous interval but not greater than 48 months.

Note 4: If the number of unacceptable snubbers is equal to or less than the number in Column B but greater than the number in Column A, the next inspection interval shall be the same as the previous interval.

)

OYSTER CREEK 4.5-18 Amendment No.:

. . . . . - . . .. .- -- . - ~.

4i j

'i c .

. TABLE 4.5-1 SNUBBER VISUAL INSPECTION INTERVAL  !

- Page 2 of 2 ,

/ t 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 snubbers is less than the number in Column C but greater than the number in Column B, . ,

the next interval shall be reduced proportionally by interpolation, that is, 1 the previous interval shall be reduced by a factor that is one-third of the ratio of the difference between the number of unacceptable snubbers found i during the previous interval and the number in Column'B to the difference ,

in the numbers in Column B and C.

Note 6: Each inspection interval shall be subject to the limitations of Technical  !

Specification 1.24 l

,i

, -j n

~!

l i

i

.i - .

i i

i

?

)

t

' OYSTER CREEK 4.5-19 Amendment No.: i

. _ . , . _. .._ .. . _ . . . , , , . .