ML19319C922
ML19319C922 | |
Person / Time | |
---|---|
Site: | Crystal River ![]() |
Issue date: | 11/21/1977 |
From: | FLORIDA POWER CORP. |
To: | |
Shared Package | |
ML19319C917 | List: |
References | |
NUDOCS 8003040867 | |
Download: ML19319C922 (8) | |
Text
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V b
' Technical Specification Change Request No. 13 Replace pages 3/4 6-8 and 3/4 6-9 with the attached revised pages 3/4 6-8, 3/4 6-9, 3/4 6-9a, 3/4 6-9b, 3/4 6-9c and 3/4 6-9d.
Reason for Proposed Change This change to Section 4.6.1.6.1 Containment _ Tendons of the CR#3 Technical Specifications is needed to provide additional detail to the surveillance requirements in order to better define how the structural integrity of the tendons will be demonstrated. This proposed change will also correct several errors in the present wording of Specification 4.6.1.6.1 as well as incorporate, to the extent possible, new NRC changes to the S&W Standard Specifications. The justification for the specific changes to Section 4.6.1.6.1 are as follows:
A) Change No.1 - The minimum liftoff value for tendon force presently in the CR #3 Technical Specifications is 1,249,000 pounds. This value applies to a 155 wire loop tendon with an initial stressing ram pressure tolerance of -200 psi and all losses in wire stress after 40 years. The maximum liftoff value for tendon force present-ly in the CR #3 Technical Specifications is 1,721,000 pounds. This value applies to a 163 wire tendon with an initial stressing ram pressure tolerance of +300 psi. These values have been replaced with liftoff forces per wire for each of the three groups of tendons. The values for the liftoff force per wire for the first year inspection are based on calculations which take into account concrete shrinkage and creep, from initial pour dates to the time of the first year inscection as well as tendon wire relaxation and elastic shortening from the time of initial tensioning to the first year inspection. The calculational methodology used to determine liftoff force reduction due to creep, shrinkage, steel relaxation and elastic shortening is described in Section 4.0 of Florida power Corportion " Final Reactor Building Dome Delamination Report". This methodology was used to arrive at the minimum and maximum liftoff force per wire frcm the concrete pour dates and tendon tensioning dates to the time of the first year inspection.
Figures 4.6-1, 4.6-2 and 4.6-3 which predict liftoff force re-duction per wire of the dome, vertical and hoop tendons from the first year of inspection through the 40 year life of the plant are based on tendon relaxation test data and concrete creep rather than logrithmic formulas. This tendon relaxation test data is described in Section 5.2.2.3.2 of the CR#3 FSAR and shown on Table 5-1 and !
Figure 5-23 of the FSAR. The values used for concrete creep through the 40 year life of the plant are contained in Section 4.0, page 4-3 of the " Final Reactor Building Dome Delamination Report".
Also shown in Section 4.0, page 4-3 of the " Final Reactor Building Dome Delamination Report" is the fact that concrete shrinkage and elastic shortening values from the first-year inspection through the 40-year life of plant remain constant.
8003040
. .- . p r i
.Tho initial tensicning value used for the tendons was.70% of thi ultimate tendon wire strength. If the full compliment of effective wires was not available, due to damage prior to installation, the corresponding tendon tensioning value was reduced to maintain the~
same liftoff force per wire as would exist in a. tendon with no damaged wire. Therefore, the initial total liftoff force per.
tendon may vary, but the initial tensioning force per wire in all the tendons was to be the same. To obtain more representative data concerning the effect of tendon liftoff force reduction on structural integrity, the force per wire provides more demonstrative tendon data. Therefore, the Crystal River (Jnit #3. tendon surveillance program is based on the liftoff force per wire rather than the total tendon liftoff force.
B) Change No. 2 - This change reflects the present NRC Standard Specification wording and positions with regard to retensioning of inspected tendons. However, we feel that the 1,3% retensioning liftoff force bounds should be qualified by the following phrase, "but never less then the minimum liftoff force per wire". This will assure that a. tendon whose liftoff force per wire that was determined during the inspection to be at or near the minimum acceptable value will not be retensioned to a value less than the minimum acceptable liftoff force per wire. Also, for clarification, a final load and elongation measurement upon retensioning is e
sufficient.
1 C) Change No. 3 - This change clarifies that one wire from a dome, vertical, and hoop tendon should be removed for inspection rather than removing one wire from all of the dome, vertical, and hoop i
tendons inspected, as the present CR#3 Technical Specifications now requires. This change is consistent with the NRC Standard Technical Specifications and Regulatory Guide 1.35.
D) Change No. 4 - The guaranteed ultimate tensile strength of the tendon wire is 240,000 psi not 14,109 psi as the present Technical Specifications now state. This is clearly described in Section 5.2.2.3.2 of the CR#3 FSAR. The 14,109 lbs. is the pull force that must be applied to a tendon wire of minimum diameter (0.27359 inches) to develop the minimum guaranteed ultimate strength value of 240,000 psi.
E) Change No. 5 - This change clarifies that only the end anchorages and adjacent concrete surfaces of those tendons inspected must be inspected rather than all end anchorages and adjacent concrete surfaces as the present CR#3 Technical Specification now states.
This change is consistent with the new NRC Standard Technical Specification wording and positions.
F) Change No. 6 - Section 4.6.l.6.3 has been retitled Contair. ment Surfaces and expanded to include visual inspection of the exposed accessible interior and exterior surfaces of the containments as well as the liner-plate. This change is consistent with the new T
NRC Standard Technical Specificaton wording and positions.
Safety Analysis of the Proposed Change No safety analysis of this proposed change is required since this
. change is being made only to clarify the tendoa surveillance require-
! ments-and criteria contained in Section 4.6.1.6.1 and in no way reduces
, the extent of the tendon surveillance program to be performed at CR#3.
. .. . /\ ,-
CONTAINMENT SYSTEMS CONTAINMENT STRUCTURAL INTEGRITY (. Prestressed concrete containment with ungrouted tendons and typ,1 cal dome.)
LIMITING CONDITION FOR OPERATION '
3.5.1.6 The structural integrity of the containment shall be maintained at a level consistent with the acceptance criteria in Specification 4.6.1.6.
APPLICABILITY: MODES 1, 2, 3 and 4.
ACTION:
With.the structural integrity'of the containment not conforming to the above requirements, restore the structural integrity to within the limits within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> or be in at least HOT STANDBY within the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and in COLD SHUTDOWN within the following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />.
SURVEILLANCE REQUIREMENTS , 4.6.1.6.1 Containment Tendons The containment tendons' structural integrity shall be demonstrated at the end of one, three and five years following the initial containment structural integrity test and at five year intervals thereafter. The tendons' structural integrity shall be demonstrated by:
- a. Determining a representative sample
- of at least 21 tendons (6
. dome, 5 vertical, and 10 hoop). Each dcme tendon shall have a lift off force per wire of between 7200 (minimum) and 9250 (maximum) pounds, each vertical tendon shall have a lift off force per wire of between 8550 (minimum) and 9900 (maximum) pounds, and each hoop tendon shall have a lift off force per wire of between 8000 (minimum) and 9650 (maximum) pounds at the first year inspection. For subsequent inspections, the l minimum and maximum allowable lift off force per wire shall be decreased from the value determined at the first year inspection to the amount shown on Figures 4.6-1, 4.6-2, and 4.6-3, for the dome, vertical and hoop tendons, respectively. This test shall include an unloading cycle in which each of these tendons is detensioned to determine if any
- For each inspection, tne tendons shall be selected on a random but representative basis so that the sample group will change somewhat for each inspection; however, to develop a history of tendon performance and to correlate the observed data, one tendon from each group (dome, vertical, and hoop) may be kept unchanged after the initial selection.
CRYSTAL RIVER 2 UNIT 3 3/4 6-8
. .: - . .; ,
_ p CONTAINNENT SYSTEMS ,
,SUPNEILLANCE REQUIREMENTS-(Continued) c wires or strands are broken or damaged. Tendons found accept-able during this test shall be retensioned to their observed lift off force,_+ 3%, but never less than the minimum acceptable 2 lift off force per wire. During retensioning of these tendons, the change in load and elongation shall be measured simultan-eously. If thi lift off force of any one tendon _in the total
, sample population is out of the predicted bounds (less than minimum or greater than maximum), an adjacent ~ tendon on each side of the defective tendon shall also be checked for lift off force. This single tendon shall be restored to the required level of integrity prior to inspection of the adjacent tendons. If both of these adjacent tendons are found acceptable, the surveillance program may proceed considering the single' deficiency as unique and acceptable. More than one defective.-
tendon out of the original sample population is evidence of abnormal degradation of the containment structure' Unless .
, there is evidence of abnormal degradation of the containment <
structure during the first three tests of the tendons, the number of tendons checked for lift off force and change in elongation during subsequent tests may be reduced to a re-presentative sample of at least 9 tendons (3 dome, 3 vertical and 3 hoop).
4
- b. Removing one wire or strand from each of a dome, vertical and hoop tendon checked for lift off force and determining that 3:
over the entire length of the removed wire or strand that:
- 1. The tendon wires or strands are free of corrosion, cracks and damage.
2 .- There are no changes in the presence or physical appear-ance of.the sheathing filler grease.
- 3. A minimum tensile strength value of 240,000 psi (guaranteed 4 ultimate strength of the tendon material) for at least i
three wire or strand samples (one from each end and one
' at mid-length) cut from each removed wire or strand.
- Failure of any one of the wire or strand samples to meet the minimum tensile strength test.is evidence of 'bnormal degradation of the containment structure.
4
. CRYSTAL RIVER - UNIT 3 3/4 6-9 e- w -- r- e , ~ v-+N*,- ,e n-m, , w w ~ , r-"w
. CONTAINMENT SYSTEMS SURVEILLANCE REQUIREMENTS (Continued) 4.6.1.6.2 End Anchorages and Adjacent Concrete Surfaces The structural integrity of the end anchorages of all tendons inspected pursuant to 5 Specification 4.6.1.6.1 and the adjacent concrete surfaces shall be demonstrated by determining through inspection that no apparent changes have occurred in the visual appearance of the end anchorage of the con-crete crack patterns adjacent to the end anchorages. Inspections of the concrete shall be perfomed during the Type A containment leakage rate tests (reference Specification 4.6.1.2) while the containment is at the maximum test pressure.
- 4. 6.1. 6. 3 Containment Surfaces The structural integrity of the exposed accessible interior and exterior surfaces of the containment, including b the liner plate, shall be determined during the shutdown for each Type A containment leakage rate test (reference Specification 4.6.1.2) by a visual inspection of these surfaces and verifying no apparent changes in appearance or other abnormal degradation.
4.6.1.6.4 Reports Any abnormal degradation of the containment structure detected during tne above required tests and inspections shall be reported to the Comission pursuant to Specification 6.9.1. This report shall include a description of the tendon condition, the condition of the concrete (especially at tendon anchorages), the inspection procedure, the tolerances on cracking, and the corrective actions taken.
CRYSTAL RIVER - UNIT 3 3/4 6-9a
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