ML20211Q994
| ML20211Q994 | |
| Person / Time | |
|---|---|
| Site: | Three Mile Island  |
| Issue date: | 12/05/1986 |
| From: | GENERAL PUBLIC UTILITIES CORP. |
| To: | |
| Shared Package | |
| ML20211Q973 | List: |
| References | |
| 3255-86-0004, 3255-86-0004-R00, 3255-86-4, 3255-86-4-R, NUDOCS 8612220215 | |
| Download: ML20211Q994 (18) | |
Text
J?';ll,,,O a e'o Muclear DATE G ITS O SITE ENGINEERING O NSR O PL ANT ENGINEERING O N1TS DEFUELING ENGINEERING TMI-2 DESIGN CRITERIA FOR PRESSURIZER DEFUELING SYSTEM Signature Concurring Organizations! Element Date 0"9'nator M g g '*5 % ,Defuelinn Fnninperinn 8~/3 ~88 Concurred by (h QMk,M Responsible Technicai Reviewer Q ' \ (!)T[
C)D Q M998,ph Manager Safety Review Group to/e/ib
/GM [. qfho s5'
- Manager of Quality Assurance fo, r/-fG C(Q E --- 2 Site Operations Director )z,)3 JPL 5
- E s
5 d
T
)
,$ Approved by ,efI'( _ \ < (A , d 't Manager, Defueling Engineering 3@ '_]
g [
861222O215 861216 0 Page1 of d DR ADOCK 0500
, --- --- - a wwe - om ---
DC 3255-86-0004 Rev. O Page 2 of 17 TABLE OF CONTENTS SECTION SUBJECT PAGE NO.
1.0 PURPOSE AND SCOPE ............................................ 3
2.0 REFERENCES
/ CODES / STANDARDS ................................... 3 3.0 FUNCTIONS AND DESIGN REQUIREMENTS ............................ 6 3.1 Functions .............................................. 6 3.2 Design Requirements .................................... 9 3.3 Process Requirements ................................... 13 3.4 Structural Requirements ................................ 14 3.5 System Configuration and Essential Features ............ 14 3.6 Maintenance and In-Service Inspection .................. 15 3.7 Instrumentation and Control ............................ 15 3.8 Interfacing Systems .................................... 15 3.9 Testing Requirements ................................... 16 3.10 Materials .............................................. 16 4.0 QUALITY ASSURANCE ............................................ 17 5.0 HUMAN FACTORS ................................................ 17 FIGURES FIGURE I PIPING & INSTRUMENT DIAGRAM, PRESSURIZER DEFUELING SYSTEM, DRAWING NO. 2C-3255-1132 FIGURE 2 PRESSURIZER GENERAL ARRANGEMENT l
11268 RP
DC 3255-86-0004 Rev. O Page 3 of 17 1.0 PURPOSE AND SCOPE The purpose of the Pressurizer Defueling System is to remove fuel debris from inside the pressurizer in a systematic and safe manner. This system will agitate and pump out the estimated 11 kg of fuel debris existing within the pressurizer and any fuel debris which may be flushed into the pressurizer from other ex-vessel defueling operations, such as pressurizer spray line defueling.
This design criteria is applicable to the following items which comprise the Pressurizer Defueling System:
- Pressurizer Vacuuming Pump
- An agitation water supply line Supporting accessories which are needed to complete the system such as long handled tools, controls, piping, fittings, flexible hosing, etc.
The existing Defueling Water Cleanup System (DWCS).
2.0 REFERENCES
/ CODES / STANDARDS l 2.1 References 1
- a. Bechtel P&ID 2-M74-DHC01, Defueling Water Cleanup System l
l 11268 RP
DC 3255-86-0004 Rev. O Page 4 of 17
- b. Burns & Roe Flow Diagram Drawing 2024, Reactor Coolant Make-Up
& Purification
- c. Babcock & Wilcox Drawing, Pressurizer General Arrangement, GPU File #07-00-0110
- d. TMI-2 Technical Bulletin TB 85-10a Rev. 1, A Reevaluation of Fuel in the Pressurizer.
- e. TMI-2 Technical Bulletin TB 86-02 Rev. O, Physical / Radiological Inspection and Sampling of the Pressurizer
- f. THI-2 Technical Bulletin TB 86-13 Rev. O, Gamma Analysis of Pressurizer Sample
- g. Babcock & Wilcox Pressurizer Instruction Manual
- h. TER 15737-2-G03-106 Rev. 9, "TMI-2 Division Technical Evaluation Report for Defueling Water Clean-up System"
- 1. SD 15737-2-M72-DHC01 Rev. O, "TMI-2 Division System Description for Defueling Water Clean-up Reactor Vessel Clean-up System" 11268 RP i
DC 3255-86-0004 Rev. O Page 5 of 17 2.2 CODES / STANDARDS 2.2.1 The following codes and standards are specifically referenced and shall be applied as required by this document.
ANSI N45.2 (1977) Quality Assurance Program Requirements for Nuclear Facilities ANSI B16.34 (1981) American National Standards Institute, Valves - Flanged and Buttwelding Ends ANSI Bl.20.1 (1983) American National Standards Institute, Pipe Threads - General Purpose ANSI B31.1 (1983 with American National Standards Winter 1984 addenda) Institute, Power Piping C ode ANSI B16.5 (1981) American National Standards Institute, Pipe Flanges and Flanged Fittings l ANSI B16.11 (1980) American National Standards l Institute, Forged Steil Fittings,
! Socket Welding and Threaded l
ANSI /ASME NQA-1 (1979) Quality Assurance Program Supplement 175-1 and Requirements for Nuclear Power Appendix 17A-1 Plants, Supplementary (including Addenda Requirements for Quality NQA-la-1981) Assurance Records ASTM A36-1981 American Society of Testing and Materials, Structural Steel ASTM A312/A312M-1985 Seamless and Welded Austenitic Stainless Steel Pipe ASTM A500-1984 American Society of Testing and Materials, Cold-Formed Helded and Seamless Carbon Steel Structural Tubing in Rounds and Shapes l
1126B RP
DC 3255-86-0004 Rev. O Page 6 of 17 10 CFR 50, Appendix 8, General Design Criteria for 1982 Nuclear Power Plants OSHA Occupational Safety and Health Standards, Part 1910, Section 1910.179, 1977.
OSHA Occupational Safety and Health Standards, Part 1926, Section 1926,550, July 1980.
2.2.2 Should any requirements of this document conflict with those of the Code or applicable standards, the more stringent requirement shall govern.
3.0 FUNCTIONS AND DESIGN REQUIREMENTS Refer.to Figure 1 for a schematic representation of this system.
3.1 Functions 3.1.1 Pressurizer Vacuuming Pump The pump will draw suction from the water inside the pressurizer. This water will contain suspended particles of fuel debris which the pump is capable of handling during suction. The pump, along with its discharge piping, will be located within the pressurizer. In order to ensure that the heavier debris is drawn into the pump, the pump unit will be lowered as close as possible to the lower head of the pressurizer.
11268 RP
DC.3255-86-0004 Rev. O Page 7 of 17 3.1.2 Agitation Water Supply Line The agitation water supply line with a nozzle shall be used to suspend debris particles in the pressurizer by using water from the DNCS. The position of the nozzle can be maneuvered using long handled tools. Since this is a closed system, the volume of water entering the agitation supply line is the same volume as being discharged by the submersible pump. Therefore the volume of water in the pressurizer remains unchanged.
3.1.3 Supporting Accessories Hose shall be used for the agitation water supply line and for the pump discharge. Valves and associated fittings shall be used to control the flow of water into and out of the pressurizer. Instrumentat.lon such as pressure and flow indicators shall be used to monitor the flow of water in and out of the pressurizer. Long handled tools shall be used to maneuver the agitation i
nozzle as required and to position the pump where necessary for effective vacuuming. To the extent practical, valves, instrumentation and pump controls shall all be centrally located and within easy reach of the operator.
11268 RP
DC 3255-86-0004 Rev. O Page 8 of 17 3.1.4 The existing Defueling Water Cleanup System (DWCS)
The existing OWCS train "B" shall be used to filter the water from the submersible pump discharge prior to returning it to the pressurizer via the agitation supply line. Water from the pressurizer will enter a knockout canister prior to being filtered. This knockout canister will retain those particles exceeding 800 microns ir size. The water will then be routed to a OWCS filter canister. The filter canisters for OWCS are capable of removing debris down to 0.5 micron in size. This would ensure that water entering the pressurizer through the agitation supply line is sufficiently clean to prevent fuel debris from returning to the water inside the pressurizer.
l l
Ouring operation of the Pressurizer Defueling System, Train B of OWCS will not be in operation except for the Train B filter canisters (F3 & F4). The remaining OWCS can be isolated by closing valves V004B and V0078 and opening V0038 (if filter canister F-3 is to be used), or by closing valves V0048 and V0038 and opening V007B (if filter canister F-4 is to be used). This will ensure that OPIT-5B will monitor the differential pressure across the filters. Valve V356 will also be closed and V357 will be open. This will create a flowcath from the submersible pump back to the agitation supply line.
1126B RP l
DC 3255-86-0004 Rev. O Page 9 of 17 During operation of Train B the Pressurizer Defueling System will not be in operation. The Pressurizer Defueling System can be isolated from DHCS by closing valves DHC-V357 and V501.
Allowing the ability to operate either DHCS or the Pressurizer Defueling System by valve alignment will maintain body feed /precoat on the DHCS filters.
3.2 Design Requirements 3.2.1 Pressurizer Vacuuming Pump The pump shall be a vertical submersible pump. The pump shall operate at 100 gpm which will ensure sufficient velocity to transport fuel debris solids. The pump shall operate at approximately 300 feet total head, with a shutoff head of approximately 450 feet. The pump shall be furnished and delivered completely assembled. The pump shall be powered by an electric motor rated for 460 volts, 3 phase, 60 Hz and have an integral cooling system. The pump shall be capable of handling particle sizes up to 1/4" in size. A minimum of 50 feet of power cable shall be supplied with the pump. The pump will be handling radioactive, borated, reactor vessel water with the chemistry described in Section 3.3. The pump shall 11268 RP
DC 3255-86-0004 Rev. O Page 10 of 17 be capable of being operated in air without damage. The overall dimensions of the pump shall be such that it can be placed down to the lower head of the pressurizer.
3.2.2 Agitation water supply line Water will be introduced into the pressurizer using a hose with a nozzle at one end. The hose diameter will be sized to accommodate the flow of the submersible pump.
The nozzle will have sufficient discharge velocity to promote agitation of debris in the pressurizer. The configuration of the nozzle shall be such that agitation occurs in all directions with a minimum of manual manipulation. The nozzle shall be stainless steel, shall i
have a full cone spray pattern with uniform distribution, and shall be of sufficient size to avoid clogging.
i l
l 3.2.3 Supporting Accessories Hose for the pump discharge and agitation supply line shall be rated for the maximum discharge pressure of the submerslole pump. The hose shall be as continuous as practical to minimize connections. Hose fittings to adapt to steel pipe shall be provided. Valves used to control flow shall be stainless steel conforming to ANSI Standards. Valves shall be temporarily supported as
! 11268 RP
DC 3255-86-0004 Rev. O Page 11 of 17 required. Flow indicators shall be installed on the s'upply and discharge lines. A pressure indicator shall be used on the discharge line. Minimum tap sizes for flow and pressure indicators shall be 3/8" in order to prevent clogging by fuel debris. These same instruments shall be located on the top of horizontal pipe to avoid being plugged from settlement of debris during no flow conditions. An On/Off switch for the submersible pump shall be provided. Existing long handled tools shall be utilized to the greatest extent possible. Design of special tools shall be minimized.
Hose and piping will be hydrostatically pressure tested prior to use to ensure against any potential line break or failure. In the unilkely esent of a hose rupture or line rupture upstream or downstream of the submersible pump the system will trip the pump on IIF low level and alarm at the control panel located on the pressurizer missile shield. The pump will trip on IIF low level because it will be electrically interlocked with the reactor vessel cleanup pump which would trip on IIF low level (Reference h). This event could deliver approximately 500 to 1000 gallons of reactor vessel water to the area of the break.
11268 RP
DC 3255-86-0004 Rev. O Page 12 of 17 Siphoning of reactor vessel water from the pressurizer through the agitation supply line is prevented by the placement of a check valve in close proximity to the pressurizer. This check valve will prevent water from flowing out of the pressurizer should a hose break occur inside the pressurizer. A hose break in the submersible pump ' discharge line is of no concern with respect to siphoning, since all unsubmerged piping and hose outside of the pressurizer is at o'r above the Reactor Vessel water level.
\ ,- 3.2.4 The Existing Defueling Water Cleanup System (DHCS) t Wate[rdischargingfrcmthevacuumingpumpwillfirstbe routed'to the. knockout canister. The water will then be directed to filter canisters F-3 and F-4 downstream of valves DHC-V0038 & V0078 respectively. Two new valves s
- DHC-V360 and V361 will be installed between V0038 and s V007B ?nd filter canisters F-3 and F-4. These new valves will be used to control flow to the filter canisters. Valve DHC-V501 will be installed to be used as an isolation' valve between DHCS and the Pressurize-Vacuuming Pump discharge line. Water to the agitation i supply line will enter through valve DHC-V357.
c
\ u x
\
11268 RP L
l l
DC 3255-86-0004 Rev. 0 Page 13 of 17 3.3 Process Requirements The complete Pressurizer Defueling System shall be used inside the reactor building and be capable of operating continuously as required. l The design temperature for components in air (hoses, valves, etc.)
is 50*F to 130*F, relative humidity of 5 to 1007. and pressure of 14.7 psia atmospheric pressure to not less than 12.2 psia.
Components in the pressurizer (submersible pump, nozzles, hose, etc.) shall be designed for external pressure ranging from 0-10 psig and the following maximum water chemistry conditions:
Boric Aci@ 4350-6000 ppm boron pH 7.5 - 8.4 Chloride ,
5 ppm Temperature 50-200*F l
I l
l Defueling performance shall be monitored as required. During the l
l monitoring activity, the vacuuming pump sha'l be turned off and the 1
water in the pressurizer shall be calm. A video camera will be used to determine the amount of debris remaining. Defueling is y then resun d as necessary. Those particles which cannot be vacuumed will be removed using long handled tools as required. The flow of water from the pressurizer shall be monitored to ensure l
1126B RP l
DC 3255-86-0004 Rev. O Page 14, of 17 that the vacuuming pump has not clogged. The flow shall be d
monitored using the flow indicator on the Pressurizer Defueling System, the video camera in the pressurizer and the flow recorders on the DHC system. Since the pump is equipped with a screen it is unlikely that the pump will clog. However, should it be necessary to unclog the pump screen, a backflush can be performed.
3.4 Structural Requtrements Structural components shall be designed in accordance with the ANSI 831.1 code. Structural components shall be designed for equipment dead loads, operating loads, and containment environmental j conditions given in Section 3.3. All structural welding shall be done in accordance with the ANSI 631.1 code. All piping shall be in accordance with ANSI B31.1.
I 3.5 System Configuration and Essential Features The system will be handling radioactive water. The system shall be designed so that doses to personnel are limited to those which are as low as reasonably achievable (ALARA). The system will be located inside the reactor building. Figure 2 shows a general arrangement of the pressurizer.
1126B RP
DC 3255-86-0004 Rev. O Page 15 of 17 3.6 Maintenance and In-service Inspection Fluids and lubricants used for the vacuuming pump shall be acceptable for use in the RCS and their quantities shall be minimized. Where feasible, fluids should be miscible and/or less densa than the pressurizer vessel water to preclude boron dilution concerns.
3.7 Instrumentation and Control The vacuuming pump shall have an On/Off switch accessible from the platform at the top of the pressurizer. Manually operated valves shall be provided on the agitation supply line and pump discharge line. These valves shall be located outside of the pressurizer.
Flow indicators shall be installed on both supply and discharge lines along with a pressure indicator on the discharge line.
Balancing the water flow for the Pressurizer Defueling System will be minimal since this is a closed loop system. However, valve alignment on DWCS must be performed to ensure that water leaving the pressurizer will not escape through unwanted flow paths.
i 3.8 Interfacing Systems The electrical power supply that will be available is 460 volt, 25 amp, 3 phase, 60 Hertz AC for continuous service.
l l
- 11268 RP
DC 3255-86-0004 Rev. O Page 16 of 17 The Defueling Water Cleanup System is used as a means of filtering the water being removed from the pressurizer.
3.9 Testing Requirements A functional test of the pump shall be performed prior to installation into the pressurizer.
Hydrostatic pressure testing is required of all piping and hoses.
The test pressure shall be 225 psig and shall be performed in accordance with ANSI B31.1. The pressure shall be held for 10 minutes. This is compatible with the DHCS test pressure and provides enough margin to ensure that the maximum pressure delivered by the pressurizer vacuuming pump (195 psig) is within the test pressure. Testing of the hose will be performed after couplings have been attached. Pipe and hose may be tested outside of the Reactor Building.
All connections will be initial service leak tested after the
! piping and hose are assembled.
3.10 Materials Materials selected snall be suitable for the use intended and for plant environmental conditions such as radiation, temperature and wetting with borated water. Wherever practical, 300 series stainless steel components shall be used. Hoses shall be made of rubber.
l 1126B RP
DC 3255-86-0004 Rev. O Page 17 of 17 4.0 OVALITY ASSURANCE This system is classified as important to safety.
5.0 HUMAN FACTORS Hose shall be used to allow for quick installation and use of existing radiation shleiding. Hoses and valves shall be properly identified by metal tags or banded to avoid misconnection or confusion. Quick disconnect couplings shall be used for ease of assembly and removal.
" Design features" such as special fittings and color coding shall be used, if possible, to preclude any potential boron dilution or loss of Reactor Vessel inventory.
I i
i l
l 11268 RP
g.
y - e .l un f
... ?
?(
- ? t il - di !! !! !! l- /
17i ,,p
- i 1 ' 21-
'; i : j> N'8 . s/ -yi
~ ". i
- ;/
~
.- n- -
., .. ,_,_ f .2 u _ _ - -
w.% 'l p. AL '; 7, h_ _- _ ,
' 4'., v i / .<.%w. 1
-r-
,. es v g '
H 2 ' , ', :
w
,I" ? V f .f g-L 1pJ M & =,Q t'_~~
"g.,3 -
g
-i {l l 3' ( ,I' W -Q X !! 'l
! lli
' s,a f .sg - - =:i u f,[/p',
. ~~- ,i e a n ! , au.- - i; ..
I
- n. r* ,
I ii
\ 7 _." -- la *g; i 1 m
.l i
- ? J ffell .,-
e Ili' 8
, II f W
% ,]' s 'ilg[*.,,I' : ;.!{ j lii i
j ji :
Q[. I;- -Orib- ,
f ik' p+'i ! E' l
S. 6 I i
('\ ~ !
. . f) i',
j
@m #
l
!g .
/
M
\
- i
" t il s !IIf'i.;.x
- d. t g--Hb,
. -M D A. :
\ ' / i I t) 1.A g gf, e
, /
,!l1,',y g p dy :
m- .
h-I h [ (, _~_. L f .r- A -
i i
'I .
W ?
g / j'
,si
- w ll i
II.Iiit
' Il PRESSURtZER GENERAL ARRANGEMENT ,
i FIGURE 2
OVERSIZE DOCUMENT PAGE PULLED SEE APERTURE CARDS NUMBER OF OVERSIZE PAGES FILMED ON APERTURE CARDS 3 APERTURE CARD /HARD COPY AVAILABLE FROM RECORD SERVICES BRANCH,TIDC FTS 492-89B9 a
1
.- .